A lot has been made of Tottenham Hotspur's sale of Lewis Holtby on Deadline Day.
Hotlby, a creative force, has his best years ahead of him at 23. But it is another Spurs midfielder whose exit some fans may be ruing.
Indeed, Gylfi Sigurdsson, similarly young at 24, has been in fine form during Swansea's start to the Premier League season.
The Iceland international was sold to the Swans as part of the deal that took Michel Vorm and Ben Davies to Spurs - so it can, of course, be seen as a necessary step for the club.
Sigurdsson, however, has been terrific as Swansea have racked up maximum points from three games, which sees them sit second in the Premier League.
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As Opta stats show, only Cesc Fabregas has registered as many assists as the 24-year-old so far this league season.
In three games, Sigurdsson has amassed an impressive four assists, while he has also created two big chances and set up no less than eight shots with his other passes.
That isn't quite on the same level as Chelsea's Fabregas - but it beats anyone else in the top flight.
The quality of opposition Swansea have faced should, of course, be taken into account, as Garry Monk has admitted he knew Burnley and West Brom would be beatable teams.
But then there was the 2-1 win at Old Trafford, when Sigurdsson himself scored the winner against Manchester United.
Could Mauricio Pochettino, then, end up regretting selling the Iceland man come the end of the season?