Davis, recovering from a hamstring strain, hasn't played in MLS action since the June 22 0-0 draw against Toronto FC. The Dynamo captain put in a 24-minute shift during Wednesday's BBVA Compass Dynamo Charities Cup against Stoke City.
Cummings, who was a late scratch before the Dynamo's 2-1 win over New England, remains questionable with a right adductor strain. Defender Anthony Arena has had his status downgraded to questionable with a right ankle sprain.
Dynamo forwards Calen Carr and Brian Ching are the only players listed as out for Saturday's match. Carr continues his recovery from an ACL tear, while Ching has a left adductor strain. Fellow forward Will Bruin remains with the U.S. national team ahead of their Gold Cup final match against Panama on Sunday.
For Chicago, midfielder Dilly Duka (right groin strain) and defender Steven Kinney (right quad strain) are listed as questionable.