Luis Enrique says Lionel Messi is already on the mend after he was forced to sit out Barcelona's 0-0 draw with Malaga on Saturday.
Messi withdrew from the squad just a few hours before the game at Camp Nou, with the club confirming he has been suffering from sickness.
Luis Enrique calmed fears Messi could be out for a long period but insisted he is happy with Alcacer's contribution given the newcomer's lack of playing time since joining from Valencia.
"Messi has to be very bad to miss a game. But it's nothing serious - he's already recovering," he told a media conference.
"We lost Messi, we lost Luis Suarez, but it's squads that win games."
On Alcacer's form, he added: "In football, you have to be consistent. In order for a player to score goals, he needs minutes.
"I'm happy with him and he keeps improving, but to pretend otherwise is illogical. I'm delighted with Paco Alcacer and with the team."
"Gerard's return is a positive. He's a leader in the team and I thought he would be able to create some chances," he said.
"They had 10 guys in their area. You have to move the ball and try to create some spaces. In the first half, when they were fresh, that's more difficult.
"I praise my players and the fans. There were chances and we tried until the very end.
"We didn't expect to lose points so I can imagine how upset my players are."
