Robbie Keane was presented to hundreds of jubilant Celtic supporters in the early hours of Tuesday morning after completing his surprise loan move from Tottenham.
The Republic of Ireland striker arrived at Parkhead to a hero's welcome on the stroke of midnight before addressing the throng waiting to greet him.
"It's absolutely unbelievable," Keane told them. "This is the reason why I've always wanted to come to Celtic."
He added: "It's no secret over the years I've been a Celtic fan. I'm hoping to bring a lot of success in the short time I'm here."
Asked why he decided to join Celtic, he said: "To play football, first and foremost. I'm no different to anyone else.
"I always wanted to play for Celtic and it works out well for both parties."
He confirmed Celtic chief executive Peter Lawwell had been trying to sign him for some time.
"Peter said it's no secret they've been trying to get me for a few years," said Keane, who has been handed the club's famous number seven jersey.
"There wasn't much persuading, to be honest with you."
Keane admitted the move was a dream, adding: "I didn't want to come here at 34 years of age at the end of my career and struggling. I think I'm coming here at the peak of my career."
Meanwhile, Celtic legend Henrik Larsson has backed Robbie Keane to be a huge hit at Celtic
He also believes the Republic of Ireland striker will need the full support of his team-mates to overhaul Rangers at the top of the Clydesdale Bank Premier League.
Walter Smith's side came through the weekend SPL action with a 10-point advantage over their rivals intact and Parkhead legend Larsson believes every single member of the team will also have to play their part between now and the end of the season.
He said: "It's a lot of work and it's not only up to Robbie - it's the whole team that has to do it.
"I know they will never give up as long as there are the points to play for, that's what it takes to play for Celtic.
"You give it your all and then see at the end of the season if you manage or not."
© Press Association