Adam Federici allowed Alexis Sanchez 's shot to squirm through his legs . The Arsenal striker was then denied by the post as he tried to clear a corner kick from Santi Cazorla, but it did not stop him scoring in stoppage time with an unstoppable drive into Reading boss Steve Clarke has backed his goalkeeper to get back on track . The Royals face Birmingham in the Championship on Wednesday night .
Adam Federici allowed Alexis Sanchez 's shot to squirm through his legs . His error meant Arsenal advanced to the FA Cup final after extra-time . Reading boss Steve Clarke has backed his goalkeeper to get back on track . The Royals face Birmingham in the Championship on Wednesday night .