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6/23/2014 8:32 P.M. ET

Severity of Phillips' bruised heel unclear

CHICAGO -- Reds second baseman Brandon Phillips was held out of the starting lineup for Monday's series opener against the Cubs with a bruise on his heel he sustained in Sunday's 4-3 win over the Blue Jays. A trip to the disabled list doesn't appear imminent, however.

"The severity is gonna be hard to tell ... I think he's feeling uncomfortable to the point where we know he couldn't play today or start," Reds manager Bryan Price said. "But he'll get in here, he's in here getting treatment, and we'll see where we go from there. It's hard for me to say. I would say right now it's a day-to-day thing.

Price didn't rule out using Phillips off the bench should the heel respond particularly well to treatment, but didn't want to tip his hand, either.

"We'll see. Even if I knew that answer I probably wouldn't give it to you, simply because I don't want to set the table for the opponent," Price said. "Once he gets some treatment, I think he can get better. If he can get good enough to be able to play or help us in some way, we don't know that yet."

Phillips sustained the injury in the third inning on Sunday, when he swung at a pitch and hit the heel with his backswing. He played the field for two more innings before he Ramon Santiago hit for him in the fifth.

Price said he saw a highlight after the game that also showed Phillips fouling a ball off his right heel, though he was unsure if that had any additional effect.

"I don't know. I can't tell you that," Price said. "When I talked to him in the dugout yesterday, I knew that he had hurt his heel and my understanding at that time was that it was with the swing, but I did see a highlight with him fouling a ball off his heel.

"In the end, for me personally, it doesn't have a great deal of relevance, simply because either way he's hurt and he's not going to start.

Skip Schumaker took Phillips' place at second and was hitting seventh in Monday's lineup, while Devin Mesoraco was slotted cleanup -- Phillips' customary spot in the order. Santiago is also a candidate to play second in Phillips' absence. Including Sunday, only four of Santiago's 19 appearances in the field this season have come at second base, though he has played 278 career games at second base.

Worth noting

• Heading into Monday's action, Todd Frazier led National League third baseman in home runs (17), slugging (.506) and extra-base hits (20), and is second in RBIs (40). He also leads the Majors with eight homers in June.

• Monday's series opener with the Cubs marked the beginning of a 10-game road trip, the Reds' final trip of the season's first half.

• Price said that following Friday's 14-9 loss to the Blue Jays, in which the Reds used six relievers over the final 3 1/3 innings, the bullpen is back to full availability. The Reds used only Carlos Contreras for one inning on Saturday and Aroldis Chapman in the ninth on Sunday.

"Some really good starting pitching got us back on top of things again," Price said.

Joe Popely is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.