Match ends, Blackburn Rovers 2, Newcastle United 4.
Newcastle scored two goals in extra time to defeat Blackburn in their FA Cup third-round replay at Ewood Park.
Sean Longstaff scored after a minute for the visitors with a deflected 25-yard shot, before Callum Roberts added the second with a fine volley.
But Adam Armstrong pulled one back from Danny Graham's pass and Darragh Lenihan's powerful header made it 2-2.
In extra time, Joselu scored from a rebound and Ayoze Perez's powerful strike sealed the win for the visitors.
Spanish striker Joselu appeared to be slightly offside for the goal that made it 3-2, as he reacted quickest after Blackburn keeper David Raya had spilled Fabian Schar's long-range shot.
Newcastle's win was their first in seven games in all competitions, since a 1-0 Premier League victory at Huddersfield on 15 December, and they will play Watford at home in the fourth round on 26 January.
It is also only the sixth time they have won an FA Cup tie since Mike Ashley became the owner of the club in 2007.
- Shrewsbury come from 2-0 down to shock Stoke
- Sheffield Wednesday beat Luton to set up Chelsea tie
- Tuesday's FA Cup third-round replays as they happened
Victory comes at a cost for Newcastle
With Newcastle 18th in the Premier League, manager Rafael Benitez made it clear that this competition was very much of secondary importance to the club.
Before the game, the Spaniard said: "Who has a realistic chance (of winning the FA Cup)? Teams in the middle of the table because they can have a go because they are safe. The other teams, you have to manage it really carefully.
"The Premier League is massive - you have £130m guaranteed if you are there. You have to be realistic."
The last thing Benitez would have wanted was this match going to extra time and injuries to key players before Saturday's Premier League game at home to Cardiff, but that is exactly what happened.
Ciaran Clark, one of only three players to remain from the side that started the 2-1 loss at Chelsea on Saturday, went off injured at half-time.
His replacement, club captain Jamaal Lascelles, injured his hamstring within three minutes of the restart, although he remained on the pitch for a further 10 minutes, before he was substituted.
In extra time, Schar and Isaac Hayden, who replaced Lascelles, were both struggling with injuries for a Newcastle side who are already without defender Paul Dummett and midfielders Mohamed Diame and Jonjo Shelvey.
But Benitez would have been pleased with the fighting spirit from his players and the performances of some of his younger squad members, with 21-year-olds Longstaff and Roberts both scoring their first senior goals.
Newcastle benefited from a bad miss from Blackburn's Bradley Dack in the first half of extra time when he shot wide, and two goals either side of the break gave Benitez's side a hard-fought victory against a team 14th in the Championship.
Newcastle score four goals in an FA Cup game for the first time in 11 years - the stats
- Newcastle have reached the fourth round of the FA Cup for the third consecutive season, having made it that far in just three of their previous 10 campaigns.
- Sean Longstaff and Callum Roberts scored their first goals for Newcastle United, while Joselu scored and assisted in the same game for the first time in all competitions for the Magpies.
- Newcastle scored four goals in an FA Cup match for the first time since January 2008, in a third-round replay against Stoke.
'Pleased with the commitment' - what they said
Blackburn manager Tony Mowbray said: "I thought they applied themselves well over the 120 minutes. The goal is offside but we have to accept it.
"Our application and desire was excellent after going two goals down.
"We missed a great chance at 2-2 when Bradley [Dack] slips a shot past the post rather than into the back of the net. It was a great effort from the players, and I feel for them.
"The character and the spirit was there for all to see, but I feel we were let down by the linesman, particularly with the third goal."
Newcastle manager Rafael Benitez, talking to BT Sport, said: "We went 2-0 up and then Blackburn did well, but we reacted so I'm pleased with the effort and the commitment of the players.
"The young players did well, and the main thing was that everybody was giving 100% for each other and that is what we did.
"The commitment and the team effort is there and you have to be pleased and carry confidence forward when you score four goals. The main thing is to get three points against Cardiff."
On a potential cup run: "Before this game, with the team selection, we have a squad that are trying to get through, and if we can do it the same way in the next round we will be pleased with that."
On injuries: "We need to wait tomorrow and see how they are, and if they cannot play then we will bring another one in. Jamaal Lascelles was limping because he felt something."
- 4ReedSubstituted forDackat 78'minutes
- 6SmallwoodSubstituted forRothwellat 103'minutes
- 19BreretonSubstituted forConwayat 65'minutes
- 7ArmstrongSubstituted forNuttallat 73'minutes
- 18FernandezBooked at 90mins
- 2ClarkSubstituted forLascellesat 45'minutesSubstituted forHaydenat 57'minutes
- 36S Longstaff
- 37RobertsSubstituted forPérezat 94'minutes
- 11RitchieSubstituted forAtsuat 109'minutes
- Lee Probert
- Shots on Target
Second Half Extra Time ends, Blackburn Rovers 2, Newcastle United 4.
Delay over. They are ready to continue.
Delay in match Danny Graham (Blackburn Rovers) because of an injury.
Delay in match Fabian Schär (Newcastle United) because of an injury.
Foul by Elliott Bennett (Blackburn Rovers).
Jacob Murphy (Newcastle United) wins a free kick on the left wing.
Attempt saved. Christian Atsu (Newcastle United) left footed shot from outside the box is saved in the bottom right corner. Assisted by Ayoze Pérez.
Attempt missed. Christian Atsu (Newcastle United) left footed shot from the centre of the box misses to the left.
Attempt saved. Joselu (Newcastle United) right footed shot from the right side of the box is saved in the bottom right corner. Assisted by Jacob Murphy.
Offside, Newcastle United. Ayoze Pérez tries a through ball, but Joselu is caught offside.
Corner, Blackburn Rovers. Conceded by Federico Fernández.
Corner, Blackburn Rovers. Conceded by Federico Fernández.
Attempt missed. Fabian Schär (Newcastle United) right footed shot from the centre of the box is close, but misses to the right. Assisted by Ayoze Pérez following a corner.
Corner, Newcastle United. Conceded by Elliott Bennett.
Corner, Newcastle United. Conceded by David Raya Martin.
Attempt saved. Joselu (Newcastle United) right footed shot from the left side of the six yard box is saved in the bottom left corner. Assisted by Jacob Murphy.
Substitution, Newcastle United. Christian Atsu replaces Matt Ritchie.
Attempt missed. Jacob Murphy (Newcastle United) right footed shot from more than 35 yards is close, but misses to the right.
Goal! Blackburn Rovers 2, Newcastle United 4. Ayoze Pérez (Newcastle United) right footed shot from the right side of the box to the top left corner. Assisted by Matt Ritchie following a fast break.