Ross has been on the disabled list since May 19 with a fracture of the navicular bone in his left foot. Sunday is the first day he is eligible to be activated, but the earliest he would likely return is sometime during the homestand that starts next week.
Boston's medical staff will probably examine Ross when the team returns from this short road trip in Toronto.
"Boy, he told me yesterday he feels ready," Valentine said. "He told me there wasn't going to be another MRI. ... He says it might just be a physical exam that will give him the green light."
Friday marked the fourth straight game the Red Sox played without Dustin Pedroia. The second baseman has been sidelined with a torn adductor muscle in his right thumb.
Pedroia is hoping to play when the Red Sox open their homestand on Tuesday night against the Orioles.
"He might take ground balls today -- that was the plan yesterday," Valentine said. "I'm trying not to get too close to him. Just want to let nature take its time."