Ex-Manchester City teammates Gareth Barry and James Milner both told the 27-year-old defender to make the switch to the Midlands.
The Czech Republic man has not played since 2013.
Celtic may be looking to trim their squad even further this summer. Here are three candidates for the chop...
The former West Ham and current Norwich midfielder feels the 30-year-old could be a superb signing for Middlesbrough, despite being linked with Sunderland.
Former Manchester City and Doncaster Rovers defender Reece Wabara has joined Scottish Championship club Glasgow Rangers on trial.
Newcastle's Sammy Ameobi is wanted by two clubs this summer.
The Gunners faithful have been enjoying the Manchester United striker's recent demise.
Liverpool have been linked with a move for Rennes attacker Paul-Georges Ntep.
LA Galaxy's 4-0 thumping of FC Toronto was a win very much made in West Ham thanks to former Hammers Robbie Keane and Seb Lletget getting all the goals.
Olivier Bernard comments on what Newcastle United’s target should be next season.