"I'm a little bit nervous, it's the first time I've travelled abroad for a game," said the 22 year old ex-Scunthorpe player.
"But I am looking forward to it and ready to meet my team-mates. When I knew Celtic were interested they were the only club I wanted to come to."
Ahead of the Champions League qualifier against the Portuguese Liga Sagres runners-up, boss Neil Lennon said of his new striker: "I don't know about playing but he will be in the squad.
"I was pleased to get him. He has been on our radar a while.
"I think we have a good player on our hands, his record is very good.
"It's not just goals, he can play a little bit as well and there were a lot of clubs after his signature."