Ausmus told reporters before Friday night's game that Martinez was diagnosed with an irregular heartbeat and could stay in the hospital on Friday night.
The Tigers expect further information on Saturday.
Martinez was experiencing dizziness and a fast heart rate on Thursday and was admitted to a hospital overnight with an irregular heartbeat.
"You know, this isn't a classic baseball DL situation, so I don't want to speak out of turn", Ausmus said before the series finale against the Tampa Bay Rays.
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Martinez will not accompany the team on their seven-game West Coast trip to Seattle and San Diego, beginning on Monday.
Martinez was removed from Thursday night's game in the seventh inning after reaching on an error. "In that sense, not only is it an eye-opener for Vic, I think it's an eye-opener for his teammates". "The doctors think after about a week he may be able to do light cardio activity". He is in the third year of a four-year, $68-million deal signed prior to the 2014 season.
Ausmus said Martinez's health scare was a bit unnerving for all of the Tigers.
Martinez has had a down year with just five home runs and a.714 OPS.