Barcelona defender Jeremy Mathieu admits he feels for teammate Thomas Vermaelen.
The former Arsenal captain's season is a write off after undergoing hamstring surgery this week.
Mathieu said: "It's difficult for him and for the group because we are left with one player less.
"We will see if the club can sign another player to try to complete our squad. Now we have only three centre-backs and Thomas will be out of action for a long time."
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