Atletico Madrid coach Diego Simeone said striker Julian Alvarez would return to the squad for Sunday's LaLiga clash against Villarreal.
The Argentina international wanted to leave the club this summer but Atletico refused to sell him despite bids from Barcelona and Real Madrid.
Alvarez, still finding fitness after his post-World Cup holiday, was not involved in Atletico's opening victory over Malaga on Wednesday.
"Yes, he's going to be included in the squad list tomorrow and he's doing better," Simeone told reporters Saturday.
"Obviously, he's still getting up to speed, like all his teammates."
Atletico fans are expected to jeer Alvarez for his attempts to leave the club, with some fans singing insulting chants about the striker against Malaga.
Simeone said the fans should be respected when asked about it previously, but reiterated that he still views Alvarez as a key player and does not agree with the criticism himself.
"Obviously I don't share in any insults or slights. Let that be absolutely clear," said the coach.
"Julian is a hugely important player for achieving the goals we have as a team. We need him, we're going to look after him.
"That's from a sporting standpoint, and we're going to stand by him. Why? Because he's our player, and as long as there are players at Atletico Madrid who are mine, I'm going to look after them."
Barcelona coach Hansi Flick, asked repeatedly on Saturday about whether the Spanish champions had given up their pursuit of Alvarez, said he would not speak about players from other clubs.