The Spain international has backed his team to lift the league title and says he is fully fit despite fears following his clash with the post in last week's match.
Diego Costa believes Atletico Madrid has what it takes to crown its season with a La Liga title.
Atleti leads the Spanish top flight with five games left to go, sitting three points ahead of Real Madrid and a further point in front of Barcelona before Friday's clash with Elche.
With Barca playing Sunday and Real not in league action this weekend, Diego Simeone's side could move six points clear and Costa claims the capital club is capable of becoming the champion.
With a Champions League semifinal against Chelsea to consider, the Spain international issued a rallying cry ahead of a decisive month.
"Now is a very crucial month. We know what we have to do," he told AS. "The team has the mentality, strength and conviction. It's very important and we will give everything. At home, with the supporters, we are very strong."
Costa had been a doubt for the game after suffering a gashed knee during a collision with the post in Sunday's win over Getafe.
However, the striker says he is available for selection as he looks to add to his 26 league goals this season.
"I'm fine. The truth is it was a scare and thank God nothing happened," he added. "I'm eager to play."