article_snippet: Celtic's Leigh Griffiths can't hide Celtic's Leigh Griffiths disappointment after the defeat by St Johnstone .
article_snippet: Celtic manager Ronny Deila sits dejected in the dugout o Wednesday night .
article_snippet: Leigh Griffiths was being rationed on opportunities at the apex of Celtic manager Ronny Deila’s side.
article_snippet: Deila opted for a switch at half-time, introducing Wakaso Mubark for Adam Matthews.
article_snippet: Deila had watched it all from the edge of Deila technical area with increasing concern.
article_snippet: Deila played Deila final hand before the hour mark, withdrawing Mackay-Steven and Stokes for James Forrest and Bitton.
article_snippet: That allowed Deila to step forward into Deila more regular role and help bring about the inevitable rise in pressure.