He was sidelined for a month after a knee operation in January and before Christmas struggled with a groin injury.
Cugat, who supervised the striker's return from recent hamstring trouble, told the Liverpool Echo of the latest problem: "It depends how it settles down.
"The decision is now up to Liverpool's medical staff and the manager."
Another significant match for Liverpool is the Europa League semi-final first leg at Torres' former club Atletico Madrid on 22 April.
Benitez admits defeat in race for fourth
Torres, who has scored 22 goals in all competitions this season, is an integral part of Liverpool's plans, but manager Rafael Benitez has admitted his side are virtually out of the Champions League qualifying race.
"To finish in the top four is now very difficult," said Benitez. "The difference is maybe too much."
The Reds boss has always vowed that the Merseysiders would finish in the top four in the Premier League, but that promise now looks unlikely to be fulfilled with his side six points behind fourth-place Manchester City having played one game more.
"We know the fourth position is a little bit far away," added Benitez, whose team has been devilled by inconsistency this season.
"We have to keep going but two or three teams have to make mistakes."
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