Costa trained with the Atletico squad yesterday.
“He’s in great spirits – he’s upbeat and happy,” said Simeone.
He continued: “We’ve had trips to Rome, Valencia, Bilbao, we played Sevilla at home… All of that involved a lot of effeort. With Chelsea, it was our turn to lose because they were the better side and now we have to learn from our mistakes.
“Next up we have Leganés, a tough game against a team who are working well and who have a coach is very good at reading games. They’ve brought in players who have made them stronger. I see a team who are determined to compete. These games always require a lot of effort. We’ll see where we can punish them – they’ll only let in three goals…”