Toronto Blue Jays shortstop Troy Tulowitzki was diagnosed with upper-back muscle bruises and a small crack in his left shoulder blade after colliding with teammate Kevin Pillar in Game 1 of Saturday's doubleheader in New York.

The Blue Jays announced they'll monitor Tulowitzki this week to determine a possible timeline for his return. The All-Star shortstop will address the injury Sunday morning, the team said.

"It's not good news, we'll probably have a little better idea in a few days how long they might think (he's out)," manager John Gibbons said postgame.

Tulowitzki suffered the injury during the second inning of Toronto's 9-5, 11-inning win over the Yankees when he backpedaled into center field in pursuit of a shallow fly ball hit by Didi Gregorius. He settled under the ball for the catch before making contact with Pillar and falling to the ground.

Tulowitzki was removed the game and underwent X-rays on his chest and back, which came back negative. A subsequent MRI revealed the small crack in his scapula.

"I couldn't feel any worse about it," Pillar said. "It's probably the worst thing I've ever experienced on the field. I've been injured myself, but to injure someone else is a nightmare you never want to have happen on the field."

Acquired at the deadline from Colorado in exchange for Jose Reyes, Tulowitzki has bolstered Toronto's defense while providing another impact bat in the middle of the lineup. The five-time All-Star has performed inconsistently at the plate since getting traded - slashing .232/.314/.368 with five homers in 39 games - but his work in the field has complemented the league's highest-scoring offense well.

Entering play Saturday, Tulowitzki was responsible for five defensive runs saved (DRS) with Toronto, according to ESPN Stats & Info, representing a marked improvement over the -7 DRS Blue Jays shortstops posted prior to his arrival.