The star catcher broke the thumb on his throwing hand while blocking a pitch six days ago. He practiced on the first day of spring training Wednesday, but an MRI later revealed the small fracture. His hand will be immobilized for two weeks, but it's possible he'll still catch pitchers during bullpen sessions.
Realmuto said he's confident he'll be ready for the season opener on April 1 but wants to make sure his thumb has healed.
"I'm not very worried about my thumb, so if I was a Phillies fan, I wouldn't be too worried," he said Thursday.
Realmuto, 29, received a five-year, $115.5 million contract from the Phillies this offseason. The $23.1 million average annual value in Realmuto's deal is the highest for a catcher in Major League Baseball history.
Realmuto continues to be one of the best all-around catchers in the majors, hitting .266 with 11 homers and 32 RBIs with the Phillies during the pandemic-shortened 2020 season. He did not accept an $18.9 million, one-year qualifying offer, instead seeking a longer-term deal on the free-agent market.
Since 2018, Realmuto leads all MLB catchers in WAR (10.1), RBIs (189) and stolen bases (16) and is second in slugging percentage (.489) and OPS (.825). His 57 home runs during that span rank third among MLB catchers.
Defensively, he has 11 runs saved over the past two seasons, which ranks fourth among catchers who have played more than 1,000 innings.
The Phillies have already added Jeff Mathis to join Andrew Knapp and Rafael Marchan as their other catchers.
Information from The Associated Press was used in this report.