Xavi, a three-time UEFA Champions League winner, believes the signing of the Sweden international is a move that can propel PSG to European success in the future.
"He is a great signing," said the Spaniard. "He performed fantastically for us and he is a top level player.
"He can bring a lot to them, and is the signing they needed to go on and win the French title.
"I don't think he had a disappointing season (at Barcelona in 2009-10).
"We won La Liga and got to the semi-finals of the Champions League, he scored important goals and we had a good understanding with him on the pitch and in the dressing room.
"He only stayed one year but he didn't leave behind a bad image."