"He was actually swinging the bat very well, and his quality of at-bats have been much better of late," Servais said. "But he's going to be out maybe three or four days. There is some significant swelling in the finger, so it's going to be tough for him to grip a bat for a couple days."
The 33-year-old has split time at first base this season with Lee in a platoon situation and has posted a .232/.279/.443 line with 20 home runs and 57 RBIs in 357 at-bats.
• Servais said the plan as of now is to stay in rotation after Thursday's off-day, which means Felix Hernandez will pitch Friday's series opener against the Astros at Safeco Field, followed by James Paxton on Saturday and Ariel Miranda on Sunday.
• Outfielder Tyler O'Neill, the Mariners' No. 2 prospect per MLBPipeline.com, was named the Double-A Player of the Year by Baseball America on Monday.
• Edwin Diaz is already just the fifth rookie in Mariners history to reach 15 saves. He needs one more to tie Danny Farquhar (2013) and Enrique Romo (1977) for No. 2 on the list, though he won't be catching rookie record holder Kazuhiro Sasaki's 37 in 2000. The other rookie to reach 15 was Mike Schooler in 1988.
Greg Johns has covered the Mariners since 1997, and for MLB.com since 2011. Follow him on Twitter @GregJohnsMLB and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.