OAKLAND -- A's first baseman Matt Olson, the rookie who has made homering a hobby, will likely be shut down for the season with a left hamstring injury.
Olson, who suffered the injury during the seventh inning of Sunday's win over Texas, underwent an MRI on Monday night that revealed a Grade 2 strain. Given the nature of typical hamstring injuries, manager Bob Melvin didn't sound optimistic about seeing Olson back in the batter's box during the club's final seven games.
"He's having a tough time moving around right now," Melvin said. "If I'm handicapping it, there's probably a tough chance for him to come back. Usually these things can be upwards of a couple of weeks. Based on the fact that we only have six games left, it's going to be tough for him."
It would be a disappointing ending to an otherwise remarkable run for Olson, who has homered nine times in his last 14 games and 16 times since Aug. 27 -- most among American League hitters.
"Not ideal timing," Olson said earlier in the day, "but we'll see if I can get back out there."

Olson, who has more home runs (24) than singles (23) during his rookie campaign, joins a long injury list. Already, the A's are without outfielders Chad Pinder (concussion symptoms) and Boog Powell (knee). Right-hander Jharel Cotton, too, could be lost for the season, after undergoing an MRI on his pitching elbow Monday. Melvin did say, however, that there is no structural damage.
Cotton made it through five innings against the Rangers on Sunday but departed at just 77 pitches because of elbow discomfort. He missed his previous start because of a groin injury.
The A's did get good news on lefty Sean Manaea, who was scratched from his previous start with back tightness. Manaea threw a normal bullpen session on Monday and is on track to make his final start of the season in Texas on Thursday.
Maxwell returns, gets ovation
• A's catcher Bruce Maxwell returned to the lineup in Monday night's 7-1 loss for the first time in five days after passing a series of concussion tests. In the second inning, he stepped to the plate for the first time since he began kneeling for the national anthem Friday and received an overwhelmingly positive response from Oakland fans. The majority of them offered a hearty applause for the rookie.