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.
A round-up of Friday's transfer news involving Newcastle United.
Newcastle United are plotting move to sign Jack Wilshere.
Everton and Tottenham Hotspur are linked to the 28-year-old, but West Bromwich Albion have acted.
Ibrox side Glasgow Rangers should consider the Aston Villa man.
West Ham United have drawn envious glances from Newcastle United fans.
Kyle Walker made his debut for Manchester City after his big money move from Tottenham Hotspur.
Newcastle United have made three signings so far this summer.
Tottenham Hotspur have signed nobody this summer, despite plenty of speculation.
Tottenham Hotspur are interested in Nice midfielder Jean Michael-Seri.
Ibrox side Glasgow Rangers should ask about the 25-year-old if Wes Foderingham joins Nottingham Forest.