Celtic boss Neil Lennon is wary of Motherwell striker Francis Jeffers ahead of today's game.
The Irishman was skipper at Parkhead in 2005 when Jeffers had a short loan period at Rangers.
"I know him, he was at Rangers," the Parkhead boss said. "It's a good bit of business for Motherwell to bring someone of his experience to the club.
"He is a good player and knows where the goal is.
"He's crafty, he flits in and out of games and suddenly pops up with a goal.
"He's already made his mark, he's scored against Aberdeen so he is someone we will need to keep an eye on."