The Belgian defender has struggled to stamp his mark on the side since moving from Arsenal for £15million in 2014.
He has been limited to SBOBET just seven league starts in three years and has only made one appearance, coming off the bench in the Copa del Ray, this season.
Vermaelen spent last year on loan to Serie A outfit Roma but again only made four starts.
The 32-year-old had the option to move onto pastures new in the summer but wanted to SBOBET stay and fight for his place at the Nou Camp once more.
But now he is regretting that choice as he watches the latter years of his career pass him by.
"In the summer I thought it would be positive to stay at Barcelona," he told Het Laatste Nieuws.
"But after seeing how my situation is here, I've seen that's not the case."
A host of European clubs will be attracted at the prospect of taking Vermaelen from La Liga.
Crystal Palace and Everton are rumoured to be keeping tabs on his situation.SBOBET
