Simao had to leave the pitch after 68 minutes of Wednesday's game and tests carried out in the morning have confirmed that he twisted a knee ligament during the win which has left Atletico second in the Primera Liga table.

The Atletico website confirmed a second degree twist to Simao's right knee.

The injury means he will miss this weekend's game at home to Sevilla as well as the trip to play FC Barcelona the following weekend and the Champions League clash against Olympique Marseilles.

Simao joined striker Diego Forlan on the injury list, while midfielder Maniche is also doubtful for the weekend after picking up a knock on his back during the win.

The Wednesday round of league matches left other players struggling with injuries in Spain.

Osasuna full back Nacho Monreal will be sidelined for at least two months after damaging his right ankle during his side's 0-0 draw at home to Deportivo la Coruna.

Meanwhile new Espanyol signing Steve Finnan had an unfortunate first start for his new club after his arrival from Liverpool. TheRepublic of Ireland international had to be carried off during hisside's 2-0 defeat away to Sevilla and the club website believes hehas a torn calf muscle, which if confirmed, will leave him out of action for around a month.

Whatever the results of the tests that will be carried out in the next 24 hours, he is certain to miss Saturday's city derby against FC Barcelona.