Cummings says he’s made for the Ibrox stage and wants to form a deadly partnership with Alfredo Morelos.
He said: “I love playing in big games. The bigger the game, it motivates me more. There are a lot of big games in this league, especially the Old Firm. Playing in that is something I’ve always wanted to do. The Old Firm is the ultimate game.
“I can’t wait for it and I can’t wait to get started. I just want to score as many goals as I can.
“Everybody knows what I will offer — I will score goals and work hard for the boys. Hopefully I can play up there with Alfredo because he looks like the type I’d like to play with.
“He likes a goal himself, is strong, young and I can see us linking up well, so the future’s bright.
“I am absolutely delighted to come to such a massive club.
“When I heard they were interested, there was no question in my mind, I wanted to sign.
“As a team we want to push celtic as much as we can. Personally I also want to get back into the Scotland squad.”
Cummings was allowed to leave Forest on loan after Mark Warburton was sacked and the forward hopes to make his move permanent.
He added: “Definitely. This is such a massive club and it’s a privilege to be here. I’m going to enjoy the next six months. I can’t wait to get out on the Ibrox pitch and play in the royal blue.”