Phillips and Robson-Kanu picked up injuries in training for West Brom, who have not played since their 1-0 defeat to Liverpool on 16 April.
"It's a blow for us," Pulis, the West Brom head coach, said of the pair, who are expected to miss the next two matches, but he expects the Venezuelan to get a first goal this year.
“Salomon Rondon has the chance to come in and score goal. He is a great lad and everybody likes him around the place.”
See: WBALEI match preview