Manager Arsene Wenger confirmed the midfielder was set for a scan but the prognosis would not be determined until later in the week .
It is now unlikely Oxlade - Chamberlain will feature in Saturday 's Barclays Premier League game against West Ham .
Manager Arsene Wenger confirmed the midfielder was set for a scan but the prognosis would not be determined until later in the week , although it is now unlikely Oxlade - Chamberlain will feature in Saturday 's Barclays Premier League game against West Ham .