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4/22/2014 8:41 P.M. ET

Blue Jays starters not providing length

TORONTO -- Heading into Tuesday's home game against the Orioles, Toronto starters ranked 27th in the Major Leagues in innings pitched with 103 2/3. Only the rotations from Minnesota, Baltimore and Detroit have thrown fewer innings, and each of those teams has played at least one fewer game.

R.A. Dickey, Drew Hutchison, Brandon Morrow, and Dustin McGowan are all averaging less than six innings per start, while Mark Buehrle (4-0) is averaging seven innings per outing.

"You want guys to go deeper into games, but if they start to lose it or tire, because of pitches or whatever it is, you need some other [relief] guys to step up and get some big outs, maybe in the sixth or seventh," said manager John Gibbons.

Gibbons said power pitchers like McGowan and Morrow are more likely to have higher pitch counts, and considering both have a history of injuries, their workload will continue to be closely monitored as the season goes on.

"That's not unusual for that style of pitcher," he said. "Your power guys, over time they throw 115, 120 pitches [a game]. But if they start to get injured, you back off."

With Toronto getting less work out of its starters, long relievers like Esmil Rogers, Todd Redmond and J.A. Happ will be increasingly relied on to bridge the gap between the rotation and middle relief corps.

"We're going to have to get big outs from guys like Redmond, Rogers and Happ in the middle of the game, and save the other guys for a little bit later," Gibbons said.

Navarro gets another day off

TORONTO -- Blue Jays catcher Dioner Navarro got a third straight day off Tuesday against the Orioles.

After sitting out Sunday against Cleveland, the Blue Jays had an off-day Monday. And with R.A. Dickey starting against Baltimore, the knuckleballer's own personal catcher, Josh Thole, was behind the plate.

Navarro, acquired through free agency in the offseason, hasn't played more than 100 games since he appeared in 115 as a member of the Rays in 2009. He played in 89 as a backup for the Cubs last season.

Manager John Gibbons said since Thole (7-for-15, .467) is hitting well, it made sense to give Navarro the day off Tuesday.

"Thole is swinging," Gibbons said. "I could tell [Navarro] was starting to slow down a bit … it helps us keep [him] fresh over the whole season, and he'll be available on the bench if we need him."

Injured Janssen with team in Toronto

TORONTO -- Blue Jays closer Casey Janssen was back with the team Tuesday after having his rehab assignment shut down over the weekend.

Janssen, who is dealing with a left abdominal injury, was sent to Class A Advanced Dunedin on an advanced rehab assignment April 15, but was shut down temporarily as of Thursday.

Now back with the team, Janssen said he hopes to throw a bullpen session this week and return to assignment "at some point."

"To be clear, it wasn't a setback," Janssen said. "I think what it was, was we realized it wasn't going to heal doing what I was doing. And so instead of putting our foot on the gas, we had to take it off a little bit and listen to my body a little bit more."

Although he's not in pain, the fact that swelling hasn't gone away could put him at risk of re-injury. Janssen said his arm still feels strong and that he doesn't believe he's lost any progress despite the shutdown.

"Obviously, my arm was in shape enough to go pitch," he said. "Having been what, a week today, I don't think I've lost a whole lot as far as the strengthening in my arm and the progress towards that. So hopefully, once I do get on a mound and I can feel nothing, you go from there, and hopefully it'll be a speedier transition."

Blue Jays claim Mastroianni, send OF to Triple-A

TORONTO -- The Blue Jays have claimed outfielder Darin Mastroianni off waivers from the Minnesota Twins and optioned him to Triple-A Buffalo. To make room on the 40-man roster, outfielder Kenny Wilson has been designated for assignment.

Mastroianni has appeared in seven games for the Twins this season, going 0-for-11. The former 16th-round Draft pick of the Blue Jays in 2007 has spent parts of four seasons in the Majors, posting a .220 average with three home runs, 22 RBIs and 24 stolen bases in 115 games.

"He's a good, tough ballplayer. He can really run, he can play anywhere in the outfield," said manager John Gibbons.

Wilson, 24, is batting .210 with one home run and eight RBIs for Double-A New Hampshire in 2014. The 2008 second-round pick is in his seventh Minor League season.

Jamie Ross is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.