Per Mertesacker twisted his ankle in FA Cup semi-final at Wembley . Scans revealed the stand-in Arsenal captain escaped serious injury . The German international was substituted after just 20 minutes of play and replaced by Lukas Podolski for the second half.
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 .