Lidge said he plans to throw another bullpen session this weekend, then hopes to pitch in a game "in three or four days."
Lidge's velocity on his fastball has been down all spring, topping out at 88 mph March 11 in his previous outing, according to scouts.
"My pop will never be there until my first game closing in the regular season," Lidge said Friday. "It hasn't been for the last 10 years. ... But that said, I should be able to get more out of it than I've had my last couple of outings."
Asked if he felt confident he could be ready by Opening Day, based on how he feels, "I was never really in doubt of that," Lidge said.
Senior writer Jayson Stark covers Major League Baseball for ESPN.com.