After weeks of transfer no-goes, the former Bayern Munich star would be an outstanding option for Slaven Bilic's squad.
Mirco Antenucci left Leeds United this summer on a free transfer.
Watford have been linked with Sofiane Boufal.
The agreement strengthens the club's presence in South Korea, and emphasises the commercial value of Heung-Min Son.
HITC Sport understands Conor Grant heading for Valley
Conflicting reports are emerging about Aston Villa's move for Bristol City striker Jonathan Kodjia.
Sunderland are reportedly keen to make David Moyes their new manager.
Joe Allen is reportedly closing in on a move to Stoke City.
Leeds CEO signed Reece Wabara for Barnsley last summer.
The Northern Ireland captain is back in training with Southampton after the Euro 2016.
The Hull City player has been linked with a move to Tottenham Hotspur.
Arsenal youngster is impressing at Charlton.
The first inkling I had that I was going to lose my job was when my boss at UBS in New York suggested we go off the desk for a coffee.
Tottenham Hotspur have a number of exciting youngsters coming through the ranks at White Hart Lane, and one has certainly impressed Walker.
Schalke's Sead Kolasinac is reportedly wanted by Chelsea, Tottenham, Juventus and Inter Milan.
Tottenham Hotspur and Manchester City have been linked with Ryan Sessegnon of Fulham, who saw Moussa Dembele leave for Celtic in the summer of 2016.
Arsenal youngster did not impress against Sutton.
Looks like he has a tough job on his hands.
West Ham came close to signing Scott Hogan in January,
West Ham United missed out on the best manager in the world according to the man widely regarded to hold that role, Manchester City boss Pep Guardiola.