liver Commons fired twice into the lead on the stroke of half - time . Partick Thistle 's James Craigen was sent off before the penalty . Stefan Johansen doubled the opposing team 's lead in the 63rd minute .
Kris Commons fired Celtic into the lead on the stroke of half-time . Partick Thistle's James Craigen was sent off before the penalty . Stefan Johansen doubled the home side 's advantage in the 63rd minute .