Real Madrid have announced that Cristiano Ronaldo has suffered a lesion to the posterior compartment of his left thigh.
The prolific attacker was forced to leave the pitch after 54 minutes of play in Madrid's 5-0 Liga win over Almeria at the weekend and underwent a series of tests on Monday morning to determine the extent of the knock.
"Following a series of tests conducted by Real Madrid's medical services at the Sanitas La Moraleja hospital, Cristiano Ronaldo has been diagnosed with a lesion to the posterior compartment of his left thigh," an official Madrid statement reads.
It remains unclear as of yet how long the 28-year-old will be unavailable because of his thigh injury, but it seems unlikely that he will feature in this week's Champions League match against Galatasaray at the Santiago Bernabeu.
Madrid currently sit top of Group B with 10 points from four games and need a draw on Wednesday to qualify for the knockout stages.