The former Red Devil has been frozen out of the first-team by Luis Enrique, with Jeremy Mathieu partnering Javier Mascherano in the heart of defence.
Pique's dramatic fall from grace has seen him linked with a move away from the Nou Camp, and it is reported that the Spain international will decide between Chelsea and United in the upcoming transfer window.
Premier League Talking Points - Gameweek 11 Round-up
Pique is a vital player for the club
Xavi
However, Barcelona veteran Xavi insists that the centre-back is one of the club's most important players, and hopes that he won't be tempted by a move to the Premier League.
He said: "Pique is a vital player for the club. You have to ask Enrique why he does not play.
"In training all I see is a motivated and committed player. It is the coach's decision and he must be respected."
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