Goals in the previous 12 minutes from Kristoffer Ajer and Ryan Christie had sent Celtic on their way to an emphatic home victory and the latter and Callum McGregor were on target during an even more dominant second-half performance.

Celtic had 26 shots at goal, 14 of them on target, while Estonian champions Kalju, who are 20 games into their league season, could not test Hoops goalkeeper Scott Bain.

Griffiths came in for Lewis Morgan as Lennon started with a back three of Jozo Simunovic, Ajer and Nir Bitton. Boli Bolingoli played on the left of midfield, although the summer signing only lasted 37 minutes before limping off for Mikey Johnston.

Celtic created chances from the off. Simunovic had two sights of goal from early corners and the visiting goalkeeper made an unorthodox stop from Christie's swerving strike.

Odsonne Edouard twice came close and Scott Brown forced a good save before the breakthrough came in the 36^th minute when Ajer headed Christie's near-post free-kick in off the bar.

Christie won a 44th-minute penalty when Reginald Mbu Alidor handled as he flicked the ball into the box, and the former Inverness man sent the keeper the wrong way.

Griffiths had a shot diverted wide before finding the top corner with a curling effort, then punching the corner flag and sinking to his knees in celebration.

The second half was a procession of Celtic chances. Christie and James Forrest both had two strikes saved and Johnston also threatened twice before Christie curled home his second from 18 yards in the 65^th minute.

Johnston forced another stop and the shots continued to rain in before McGregor drilled into the bottom corner from 22 yards in the 77^th minute.

French midfielder Olivier Ntcham came off the bench for his first appearance of the season following his trip to the UEFA European Under-21 Championship finals, and Celtic cruised through the closing stages.