Vladimir Guerrero Jr. won't be available for Saturday's game against the New York Yankees, but one of the Toronto Blue Jays' top prospects will be.
The Blue Jays activated left-hander Ricky Tiedemann hours before first pitch (3 p.m. ET / noon PT, Sportsnet and Sportsnet+), the team announced. Chase Lee was optioned to triple-A in a corresponding move.
"It’s big," Tiedemann said Saturday of his first MLB call-up. "I mean, not only for me, but for everybody that sacrificed anything for me growing up and getting me to games; my family, my parents. So it's big for all of us.”
Tiedemann was once the Blue Jays' No. 1 prospect according to MLB Pipeline, but injuries have derailed his development in recent seasons.
He went under the knife for Tommy John surgery in 2024, missed the entire 2025 season and then was slow to build up this season due to elbow soreness. He was activated from the minor-league IL on Aug. 5 and has made three relief appearances for triple-A Buffalo in the week since, allowing four runs and five hits with four strikeouts.
The news wasn't quite as good for Guerrero, who was placed on the seven-day injured list with a concussion after taking a knee to the head in Friday's 3-1 win over New York.
Guerrero was injured on a chaotic play when George Lombard Jr.'s left knee hit the side of Guerrero's head as he slid toward third base, sending his helmet flying.
After the ball got by Lombard, Guerrero got to his feet and made his way home to score the Jays' first run of the game.
He winced after crossing home plate and was briefly tended to by trainer Jose Ministral before walking to the dugout and leaving the game.
The slugger is having a cold 2026 with a .263/.337/.356 slash line and just seven home runs — none of which have come at Rogers Centre.
With Guerrero out, the Blue Jays called up outfielder Daz Cameron from triple-A who will be active for Saturday's game.
Just one game out of the final wild-card spot in the American League, the Blue Jays will look to clinch a series victory over the Yankees on Saturday.
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