Celtic midfielder Stuart Armstrong has agreed a proposed move to Southampton, with the four-year deal expected to be completed this week.
The Scotland international, 26, signed a new two-year deal last summer despite reported interest from Saints.
Armstrong has been at Celtic since early 2015 and Southampton agreed terms for the player's transfer last week.
Saints are ready to pay an initial fee of £7m, which could rise further depending on various factors.
Southampton narrowly avoided relegation from England's top flight last season, finishing in 17th place.
Armstrong started his career with Inverness Caledonian Thistle and spent four-and-a-half years with Dundee United before joining Celtic.
He has won four Scottish Premiership titles, two Scottish Cups and two Scottish League Cups in Glasgow, playing a key role in the back-to-back domestic Trebles under manager Brendan Rodgers.
Armstrong scored 17 goals in Rodgers' first season, leading to his first Scotland cap against Slovenia in 2017.
Injury hampered his impact last season, though he played four more games for Scotland to take his tally to six caps.