Arsenal defender Tierney sidelined with dislocated shoulder

FILE PHOTO: Soccer Football - Premier League - West Ham United v Arsenal - London Stadium, London, Britain - December 9, 2019 Arsenal's Kieran Tierney is substituted after sustaining a shoulder injury Action Images via Reuters/Tony O'Brien

(Reuters) - Arsenal defender Kieran Tierney faces a spell on the sidelines after dislocating his right shoulder in Monday's Premier League win at West Ham United, the club said on Wednesday.

The 22-year-old left back was substituted just before the half-hour mark in Arsenal's 3-1 derby victory at the London Stadium after falling awkwardly and used his shirt as a makeshift sling as he left the pitch.