The defensive duo were injury concerns after Thursday night's UEFA Cup draw against Anderlecht.
Young-Pyo was stretchered off 10 minutes from time after a clash of heads while Pascal was helped off the pitch by medical staff after picking up a late knee injury.
"Pascal had a knock to the knee, nothing too serious and we expect them both to be okay for Sunday," said first team coach Gus on Friday afternoon.
Robbie Keane will have to sit it out as he serves the first of his three-match suspension following his dismissal against Birmingham.
Gareth Bale (foot), Anthony Gardner (ankle) and Benoit Asou-Ekotto (knee) remain out.
Gus Poyet reports that Pascal Chimbonda and Young-Pyo Lee should be fit to face Manchester City at the Lane on Sunday.