Liverpool manager Jurgen Klopp admits they "got lucky" with Andy Robertson's ankle injury, despite the left-back being ruled out for the first few weeks of the Premier League season. The Scotland international had to be helped off the pitch during Sunday's friendly with Athletic Bilbao and further assessment has revealed a problem which will prevent his involvement against Norwich in their season opener and beyond. Robertson said on Twitter the injury was "nothing too major" but it is understood his absence will still be a number of weeks. "I think we got lucky with Andy, it could have been much worse," Klopp said. "The footage didn't look too well but we got lucky and it will not be too long." Robertson is remaining upbeat despite being pictured outside a Liverpool hospital on Monday with his foot in a protective boot. "Scan suggests nothing too major but there's some ligament damage which will need to mend," he tweeted. "I will be grafting every day so I can help the team again sooner rather than later." Robertson's injury makes it increasingly likely Greece international Kostas Tsimikas, who managed just six Premier League minutes in his maiden campaign for the Reds last season, will make his first league start at Carrow Road. In better news for Liverpool, summer signing Ibrahima Konate has looked solid in pre-season to give Klopp multiple options in the centre of defence - with Virgil can Dijk, Joel Matip and Joe Gomez fit again. Australian Associated Press