PHOENIX -- Diamondbacks first baseman Conor Jackson underwent an MRI on his right quadriceps before Saturday's game against the Nationals, and will likely be out for the remainder of the homestand, which lasts through Sunday.

Jackson strained his quadriceps while trying to get out of the way of a pitch during Friday night's 7-4 loss.

"He had it earlier in the season and it was getting progressively better," manager Bob Melvin said. "He's been playing with it, but it was hurting him significantly enough where he needed to come out."

The results of Jackson's MRI weren't known before the game, but Melvin doubts the injury will put him on the disabled list.

"We were thinking last night and earlier today that maybe [he'll be out] a couple days, but we'll see what the MRI has to say," Melvin said. "Our feeling still is that this will just be something that will keep him out for a couple of days."

The timing of the injury could have been worse. Veteran Chad Tracy, who came off the disabled list on Monday, will temporarily fill in for Jackson at first base, and made his second start of the season there in Saturday's matchup with the Nationals.

On Friday night, Tracy had his first multihit game of the season and even hit his first home run of the year while starting at third base. The 28-year-old, who was batting cleanup on Saturday, has gone 4-for-13 (.308) since rejoining the club.

Tracy had surgery on his right knee before the season, before his 12-game rehab assignment in Triple-A Tucson.

"He just adds another productive bat, especially from the left side of the plate, that can get us some production while we're going through some offensive woes," Melvin said.