Liverpool defender Andy Robertson has confirmed he suffered ankle ligament damage in the 1-1 pre-season friendly draw with Athletic Bilbao.

The Scotland international limped off after attempting to block a cross and was replaced at half-time by Owen Beck.

Manager Jurgen Klopp said further tests were required to determine the level of damage, casting doubt on Robertson's availability for Liverpool's opening game of the Premier League season away to Norwich City on August 14.

Ahead of Monday's friendly with Osasuna, the Reds' final warm-up game before the 2021-22 season, Robertson said via Twitter that he expected to be sidelined for a time.

"Thanks to everyone for the kind messages and support," he wrote. "Scan suggests nothing too major but there's some ligament damage which will need to mend.

"I will be grafting every day so I can help the team again sooner rather than later. Good luck to the boys playing tonight."