Real Madrid have confirmed that Trent Alexander-Arnold suffered a quadriceps injury on his left leg in their 3-0 win over Athletic Club on Wednesday, and a source told ESPN he will be out for at least two months.
He went off in the 55th minute at San Mamés and was replaced by Raúl Asencio.
"Following tests carried out today on our player Trent Alexander-Arnold by the Real Madrid Medical Services, he has been diagnosed with a muscle injury in the rectus femoris of his left quadriceps. His recovery will be monitored," the club said in a statement on Thursday.
The right-back appeared to suffer a muscular problem after kicking the ball upfield, limping on the sidelines before asking to be withdrawn.
Midfielder Eduardo Camavinga was also substituted with an ankle problem,
Alexander-Arnold's debut season at the Bernabéu -- after joining from Liverpool in a high-profile move last summer -- has already been heavily disrupted by injuries.
Having earned his place in the Madrid starting XI in the Club World Cup, he picked up a thigh problem in September, and was absent for a month.
His absence came with Dani Carvajal also unavailable, meaning midfielder Federico Valverde had to fill in at right-back.
Since returning to fitness last month, Alexander-Arnold had faced some criticism for his displays -- coinciding with the team's struggles -- but he looked much improved against Athletic.
Information from ESPN's Rodra was used in this report.
