The right-hander tweeted "working on my tipping" Monday with a GIF of himself drinking a beer in a pool.
Verlander matched a career high by allowing nine runs Saturday in the Indians' 13-6 win over the Tigers. He gave up 11 hits in four-plus innings, including home runs by Carlos Santana and Lonnie Chisenhall. The 2011 AL Cy Young Award winner and MVP also gave up nine runs against the Chicago White Sox on April 6, 2008, and versus Texas on May 25, 2014.
On Sunday, McCann strongly hinted that he believed Verlander was tipping his pitches as opposed to having signs stolen.
"We use multiple signs with nobody on base. We change our signs often. It's got to be something other than that," McCann told reporters, according to mlive.com.
"For a day where I thought he had his best stuff all season, they seemed to be on quite a few pitches," McCann said. "What that is, I don't know. We're going to study film and see."
Indians manager Terry Francona said his team wasn't stealing signs.
"I'm just happy when our guys get our signs -- and I'm being serious about that."
Asked if he thought Verlander might be tipping his pitches, Ausmus told reporters: "Could be."
"Hitters are always trying to find an edge on pitchers. And looking for a pitcher tipping is standard operating procedure. I can't tell you whether it is or isn't. Only the Indians could tell you that, and they probably won't," he said, according to mlive.com.
The Associated Press contributed to this report.