Before Tuesday’s game against the Toronto Blue Jays, Orioles manager Brandon Hyde said first baseman Ryan Mountcastle was feeling “much, much better” despite being out of the lineup for the fifth time in six games with an undisclosed illness.

Hours later, Baltimore placed Mountcastle on the 10-day injured list with vertigo, the sensation that the environment around oneself is moving or spinning. About 4:15 p.m. Tuesday, Hyde said Mountcastle was set to go through a full pregame routine and be available off the bench, with hopes he could be in Wednesday’s lineup. The roster move, which is retroactive to Saturday, came just before the game’s 7:05 p.m. first pitch.

To fill Mountcastle’s place on the active roster, the Orioles selected the contract of Mark Kolozsvary, adding a third catcher to the roster. Baltimore designated right-handed pitcher Noah Denoyer — the organization’s No. 20 prospect according to Baseball America — to create a 40-man roster spot for Kolozsvary.

Mountcastle, 26, leads the Orioles with 11 home runs, though he hit only one in his past 15 games while batting .158 with a .459 OPS and 20 strikeouts in 65 plate appearances. In his past eight games, Mountcastle was 4-for-30 with no extra-base hits and 11 strikeouts. The IL stint comes at an unfortunate time for Mountcastle, who has dominated the Blue Jays. In 45 career games against Toronto, Mountcastle has slashed .306/.368/.613.

Kolozsvary hit .200/.238/.450 for the Cincinnati Reds last season in his first major league action. The Orioles claimed him on waivers in October and outrighted him off the 40-man roster the next month. Between Double-A Bowie and Triple-A Norfolk, the 27-year-old was hitting .172 with a .549 OPS in 25 games, often spending time with the Orioles as a member of their taxi squad.

Signed as a free agent after going unselected in the 2019 draft, Denoyer, 25, was added to Baltimore’s 40-man roster in the offseason to protect him from the Rule 5 draft after he posted a 2.61 ERA and 35.4% strikeout rate for Bowie last year, working largely as a bulk reliever. In a similar role this season at Triple-A, he has a 5.04 ERA while walking 6.5 batters per nine innings, more than triple his rate from last season. The Orioles have a week to trade Denoyer or try to pass him through waivers.

This story will be updated.

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