The Dutch midfielder is rumoured to be wanted by incoming Red Devils boss Erik ten Hag, who worked with De Jong at Ajax before the player’s 2019 move to Spain.
While a transfer exit is not Xavi’s preference, the Barcelona boss has stated that De Jong’s future may be taken out of his hands.
“For me he is very important,” Xavi told reporters on Saturday.
“He has been a starter practically every game, except when he has been rotated due to tiredness, fatigue or competition. For me he is fundamental.
“But we all depend on the economic situation of the club.”
Barcelona have endured a wretched couple of years economically with Lionel Messi departing last summer before a surprisingly busy January transfer window.
“Of course there are,” Xavi said when asked if any of his squad was untouchable in the summer window.
“They are in my head. I have it clear. From there, we have to see what the [economic] situation is and our ability to manoeuvre.”