Ohlman had his contract purchased from Triple-A Buffalo on Monday, Mike Wilner of BlueJaysTalk reports.
Ohlman was added to the roster to take the place of Russell Martin (shoulder), who was recently placed on the 10-day disabled list. The 26-year-old was slashing .246/.388/.594 with seven homers and a 28:15 K:BB through 23 games with Buffalo before earning the promotion. He should serve as the backup to Luke Maile as long as the veteran is sidelined.