The Italian international had been expected to leave the club this summer.
The Portuguese confirmed that the 32-year-old has undergone surgery.
Celtic were embarrassed in Brendan Rodgers' first competitive match in charge.
Stoke City striker Peter Crouch has been linked with a move to Newcastle United.
The youngster endured a difficult year in the Premier League last season.
Arsenal could be without a few key players for the start of their Premier League season.
The Tigers' boss is said to be in the running for the job.
Leeds United signed Rob Green from Queens Park Rangers earlier this summer.
Celtic are due to face Lincoln Red Imps in the second-leg of their Champions League qualification tie.
Samuel Umtiti looks set to join Barcelona from Lyon after the French club’s president confirmed he has agreed a deal for the defender to move to La Liga.
Nearly half a century ago, Paul Simon asked the musical question: “Where have you gone, Joe DiMaggio/ a nation turns its lonely eyes to you.”
LeBron James has declined the player option on his contract and will become a free agent on July 1, his agent Rich Paul has confirmed to ESPN – but he’s sure to return to the Cavaliers next season.