Bolton Wanderers boss Sammy Lee says he's signed Portsmouth defender Andy O'Brien to add steel to his team.

Lee said: "Andy plays with a lot of aggression - he is an out-and-out defender - and that will help us.

"He is a nice one to have on board. One thing Andy brings is Premier League experience.

"I have been impressed with his defensive qualities throughout the years, and he is good addition to the squad."