Blash is playing for Triple-A Tacoma, while Austin is with Double-A Jackson. Both suspensions are immediately in effect.
Blash, 24, was hitting .210 with 12 home runs and 37 RBIs in 45 games since being promoted to Tacoma after batting .262 with five homers and 20 RBIs with Jackson. The 2010 eighth-round Draft pick is rated the Mariners' No. 18 prospect by MLB.com.
Austin, 23, is hitting .262 with one home run, 16 RBIs and 19 stolen bases in 63 games for Jackson.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.