The 27-year-old made more than 85 league appearances for the Gunners from 2005-08 before departing for the Camp Nou for £11.8 million.
But the Belarusian has struggled to establish himself in Pep Guardiola's first-team, making just 12 La Liga outings as the Catalans soared to the top of the table.
"Adapting here has not been easy," the 27-year-old told a news conference. "I'm in a squad in which almost all the players could be in the starting eleven and getting playing time is difficult.
"It's a new experience for me and one I have to learn from."
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