Atletico Madrid have revealed that midfielder Tiago Mendes sustained a injury to his right thigh muscle in the 1-0 defeat of PSV Eindhoven on Tuesday.
The Portuguese footballer picked up the knock in the 1-0 defeat of PSV Eindhoven in the Champions League on Tuesday.
The 35-year-old had only replaced Nicolas Gaitan in the 61st minute, but saw out the game after getting injured.
A statement from the club read: "Our midfielder has undergone a magnetic resonance and the medical report indicates that he suffers a grade I-II muscle injury to the right thigh.
"Tiago Mendes finished the Champions League match against the PSV with aches and pains. On Wednesday the Portuguese midfielder has undergone a magnetic resonance in the Fremap Clinic of Majadahonda that determined the extent of his injury.
"Tiago's updated medical report indicate that he suffers a grade I-II muscle injury to the biceps femoris of the right thigh. With the help of our physiotherapists, our midfielder will do some alternative pieces of training in the gym in order to come back to the team as soon as possible."