Carrick added: "If it goes through then it's great news. We welcome him, he had a terrific season last year. He'll just strengthen our squad even more.
Carrick welcomes Van Persie
"The manager has gone on record as saying that the team in '99, because of the four forwards they had, was one of the most exciting and one of his happiest times. So hopefully we can repeat something like that.
"It's a huge boost. He's a terrific world class player and it's great to bring in players of that ability and give everyone a boost."
Van Persie scored 44 goals in 57 games for club and country last season, including two against United.
He was entering the final season of his contract at Emirates Stadium and stated earlier this summer that he
did not want a renewal.
Redknapp predicted success for Van Persie - who
joined Arsenal as a 20-year-old
in 2004 for £2.75m - at Old Trafford, and sounded an ominous warning to other Premier League sides.
Reaction on Twitter
Arsenal supporter and TV host Piers Morgan:
"Funny, I really thought @Persie_Official was different. But he turned out to be just another mercenary."
Manchester United defender Rio Ferdinand:
"Tears for Piers!"
Reading striker and BBC Sport pundit Jason Roberts:
"Is it RVP's fault? Has he just decided to go to a club that is going to genuinely challenge for titles..."
Olympic gold medallist Greg Rutherford:
"@Persie_Official Looking forward to seeing you in a United shirt! Great move!"
England coach and ex-Manchester United full-back Gary Neville:
"Good result, thought we played some good stuff and RVP signs for United!"
Former England cricket captain Michael Vaughan:
"The Arsenal academy system is working well for the north west..."
"If he performs like he did last year then him and Rooney will just be an incredible partnership," Redknapp said.
"He's a special player and he's a fantastic signing for Manchester United."
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