Tony Beltran is missing for Real Salt Lake as he recovers from surgery on his right knee.
Jordan Allen is another player who will miss out for the away side, with Joao Plata also a doubt for RSL ahead of their game at Talen Energy Stadium.
Luke Mulholland and Demar Phillips are carrying knocks.
The Philadelphia Union have struggled for consistency of late. They have won just two of their last four games, but there are teams in MLS who have suffered from worse form in recent weeks. They need to find some rhythm.
Real Salt Lake can score goals, as they showed against DC United at the weekend, seeing off the capital side 3-2 at Rio Tinto Stadium. However, Mike Petke's side don't do that too often. Consistency has been their issue.
Both teams have struggled for form, but RSL have a track record of scoring goals.
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