The Dutch midfielder is rumored to be wanted by new Red Devils boss Erik ten Hag, who worked with De Jong at Ajax before the player moved to Spain in 2019.
Although a transfer exit isn’t Xavi’s preference, the Barcelona boss says De Jong’s future could be taken away from him.
“For me he is very important,” Xavi told reporters on Saturday.
“He’s been a starter in practically every game, except when he’s been rotated due to tiredness, fatigue or competition. For me, he’s fundamental.
“But we all depend on the economic situation of the club.”
Barcelona endured two economically miserable years with the departure of Lionel Messi last summer ahead of a surprisingly busy January transfer window.
“Of course there are,” Xavi said when asked if any of his squad members were untouchable during the summer window.
“They are in my head. I have it clear. From there, you have to see what [economic] situation and our ability to maneuver.