Celtic manager Martin O'Neill admits his squad will have to "hang in there" until they reach full fitness. Captain Callum McGregor missed Saturday's visit of Falkirk through illness while Celtic were also without striker Kasper Hogh, right-back Alistair Johnstone and midfielder Reo Hatate through injury. The Parkhead club are still waiting for the return of long-term absentee Jota while there were fresh concerns for left-back Kieran Tierney and striker Callum Osmand after Saturday's 2-1 win.