The Argentine midfielder, who was released by Queens Park Rangers this summer, has attracted interest from Fulham, with Brentford likely suitors.
The talented midfielder has been linked with a move away from the German giants with Tottenham Hotspur allegedly interested.
Players from Liverpool, Arsenal and West Ham United were named in Uefa's team of France 2016.
The Hibernian manager’s comments would be bad news for Glasgow Rangers, Wolverhampton Wanderers and Derby County.
The Villa manager is pleased with the trio of players he has brought in but emphasised that he still needs to cut down his squad.
Liverpool were 1-0 winners during their pre-season friendly with Tranmere on Friday.
The Baggies are said to be eyeing a move for Dieumerci Mbokani.
Steven Fletcher recently joined Sheffield Wednesday after leaving Sunderland at the end of last season.
Part of Manchester United's pre-season sees them facing Manchester City, Borussia Dortmund and Galatasaray.
The Magpies midfielder starred for France at Euro 2016.