Fantasy managers need to stay sharp on the fantasy baseball waiver wire as a wave of injury news reshapes rosters across the league this June 21, 2026. From a concussion-protocol placement for one of the game's best catchers to a brewing outfield streaming opportunity in Atlanta, the MLB injury report is packed with actionable intelligence today. Read on for the five biggest signals and what each one means for your lineup decisions right now.

Adley Rutschman (BAL) — Injury Update

Rutschman was struck in the head by an errant throw during Thursday's contest and has been placed on the 7-day injured list as a result. Beyond the initial IL stint, he will need to fully clear concussion protocol before any return to action is permitted, making his exact timeline genuinely uncertain.

For fantasy managers, losing Rutschman is a top-five catcher-level hit. Baltimore has Sam Huff available for depth behind the plate, but Huff is not a viable plug-and-play at the position in most formats. Scour your fantasy baseball waiver wire immediately — streamable catchers with favorable upcoming schedules are the priority add of the day.

Early signal (high severity)

Chris Bassitt (BAL) — Injury Update

Bassitt was placed on the 15-day IL on June 8 due to low back discomfort, but there is now encouraging news: he appears set to begin working toward a return. The right-hander will likely need at least one bullpen session and potentially a round of live batting practice before a minor-league rehabilitation assignment would begin.

Even with the positive trajectory, fantasy managers should not expect Bassitt back in the immediate future. A realistic MLB return is still several weeks away at minimum, so he remains unplayable and should sit on IL roster spots in leagues that allow it. Monitor the bullpen sessions closely — successful outings will be the clearest signal that he is trending toward a real return date.

Trending below his recent form

Michael Harris II (ATL) — Injury Update

Harris was removed early from Tuesday's game against the Giants with lower-back tightness and subsequently sat out Wednesday for Atlanta as well. Mauricio Dubon is stepping in at center field while Harris is considered day-to-day. On the season, Harris has been one of fantasy baseball's most productive outfielders, slashing .306/.340/.514 with 14 home runs and 41 RBI in 245 plate appearances.

The day-to-day tag means Harris could return at any moment, but lower-back issues carry real escalation risk, especially when they sideline a player for multiple consecutive games. Dubon is a thin replacement and is not a meaningful fantasy baseball waiver wire add in most leagues. If you roster Harris, avoid starting him until he is confirmed in the lineup — back issues at this level can linger or worsen without warning.

Early signal (high severity)

Dean Kremer (BAL) — Return From Injury

Kremer has transitioned from live batting practice to actual game action at Triple-A Norfolk as he continues his recovery from a quad strain. The next phase of his path back will require several more outings at that level before the Orioles would consider adding him back to the MLB roster, with an early July return window appearing most realistic.

Kremer is a low-end streamer when healthy, but given Baltimore's already battered rotation — with Bassitt also on the shelf — his eventual return carries added fantasy relevance. Keep him stashed on your IL if your league allows it and check back in early July for a clearer activation timeline. He is not a fantasy baseball pickup to rush back yet.

Trending well below his recent form

Carlos Santana (ARI) — Return From Injury

Santana has progressed to rehab game action, logging five innings and taking batting practice at Chase Field as he works his way back. The catch is that his specific role upon returning to Arizona remains genuinely unclear, with a crowded infield and DH situation making it difficult to project his playing time.

Until Arizona clarifies where Santana fits in the lineup pecking order, he is a speculative hold at best for fantasy managers in deeper leagues. His power and on-base skills are still useful in the right context, but uncertain playing time is a major red flag. Monitor MLB player news out of Arizona over the next several days for any roster or lineup clarity before committing a roster spot to him.

Early signal (medium severity)

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