Arsenal full-back Hector Bellerin has had to visit hospital for tests on a knee ligament injury, manager Arsene Wenger has confirmed.
The Spain international had played every minute of the Gunners' Premier League campaign until he was not included in the starting line-up for Sunday's 2-1 Premier League defeat to Brighton and Hove Albion.
Wenger said on Wednesday that Bellerin will not return for the first leg of the Europa League last-16 tie with AC Milan, although he does not fear the problem is long term.
"No, he is injured," Wenger told a news conference when asked if Bellerin would feature at San Siro on Thursday.