SAINTS center Mark Percival returns to the squad for the first time since May for Saturday’s do-or-die Super League semi final against Salford. (1pm).
Sione Mata’utia also returns after a lay off with a foot injury – but Will Hopoate has not made the squad.
Percival has not played for almost four months with his last outing being the league clash at Warrington.
But Woolf has no qualms about pitching in the international three-quarters for such a huge do-or-die game.
“Mark is one of the most natural football players I have ever dealt with and he is an outstanding player and an elite player,” Woolf said.
“You could easily say he is the most influential center in the competition – the way he plays, off the cuff, plays what he sees and plays tough and competes hard.
“He is a player you want in your team in the big games.”
Sam Royle also comes in to the squad with the youngsters who played against Toulouse dropping out as expected.
Hopoate has not recovered in time and neither has Josh Simm following his injury sustained in the tip-tackle against Wigan.
Prop Dan Norman misses out after scans revealed he fractured his cheekbone against Toulouse.
Saints: 1st Jack Welsby, 2nd Tommy Makinson, 4th Mark Percival, 6th Jonny Lomax, 9th James Roby, 10th Matty Lees, 11th Sione Mata’utia, 12th Joe Batchelor, 13th Morgan Knowles, 14th .Joey Lussick, 15th LMS, 16th Curtis Sironen, 17th Agnatius Paasi, 19th Jake Wingfield, 20th James Bell, 22nd Ben Davies, 23rd Konrad Hurrell, 26th Sam Royle, 27th Jon Bennison, 31st Taylor Pemberton.