The 31-year-old becomes the club’s fifth summer signing after Odsonne Edouard, Scott Bain, Daniel Arzani and Eimilio Izaguirre.

The Congolese international impressed during a 20-game spell at Kilmarnock last season and scored the only goal in a 1-0 win over his new employers.

“I walked on to the pitch when I signed and it felt amazing,” said the former Norwich City and West Brom player. “These are the reasons we play football.

Youssouf Mulumbu in the stands at Celtic Park. Picture: SNS Group Ross Parker

“My immediate focus is to stay fit and ready and be 100 per cent ready. I’ve played at Celtic Park as the opposition and it’s a special place to play, so I’m looking forward to being part of the team and playing there.

“I cannot describe how amazing this day is for me, but it’s one step to the other. I have signed but now I must work hard to play.

“The first goal for me is to show to the manager that I’m ready. Anytime he needs me I will respond on the pitch. I know the game and what is expected of me so I’m going to be ready when the gaffer needs me.

“This is what you work for as a footballer. To play in a big team like Celtic is just amazing. I always work very hard and I want to help the young lads here. We have so much to achieve. We need to do well in the Europa League, retain all the domestic trophies and continue winning the Glasgow derbies. It’s amazing to be part of that.”

Done deal: Celtic complete signing of midfielder Youssouf Mulumbu