Per Mertesacker twisted his ankle in FA Cup semi - final at Wembley . Scans revealed the stand - in Arsenal captain escaped serious injury . Arsenal beat Reading 2 - 1 after extra - time in Saturday 's replay . They host Premier league champions replay on Saturday at 7 pm . CLICK HERE for all the latest Arsenal news .
Per Mertesacker twisted his ankle in FA Cup semi-final at Wembley . Scans revealed the stand-in Arsenal captain escaped serious injury . Arsenal beat Reading 2-1 after extra-time in Saturday 's match . They host Premier League leaders Chelsea on Sunday at 4pm . CLICK HERE for all the latest Arsenal news .