The reported Liverpool target says he's disappointed at Camp Nou.
Speculation has mounted (Mundo Deportivo) from Spain that Reds manager Jurgen Klopp is keen on bolstering his defence with the addition of the former Arsenal centre-back this summer, with the fit-again Belgian managing just 20 appearances in all competitions in the 2015-16 campaign.
An injury-ravaged first season at Camp Nou saw the 30-year-old play just once in the Catalans' treble-winning campaign of 2014-15, but even since returning to full fitness he has found himself surplus to requirements under coach Luis Enrique.
Nevertheless, Vermaelen was named in Marc Wilmots's 24-man Belgium squad for Euro 2016, and he admits that national team duties is a welcome release following a low-profile time at Barcelona as of late.
"The last few weeks have been disappointing for me so I'm glad to be with the national team," he said via Marca.
Liverpool may need a few new centre-halves this summer, with Kolo Toure expected to fail in his bid to earn a contract extension, whereas Martin Skrtel, according to his agent's comments via The Echo, is almost certain to leave.
Mamadou Sakho's future at Anfield also hangs in the balance after the France international failed a drugs test, resulting in a 30-day worldwide ban - which expires on Saturday - until it is determined if further action is necessary.