FORT MYERS, Fla. — The Red Sox added two players to their major league roster Wednesday, signing free agent infielder Isiah Kiner-Falefa to a one-year, $6 million contract (pending a physical) and claiming catcher/infielder Mickey Gasper off waivers from the Nationals.

Kiner-Falefa, who turns 31 next month, hit .262 with a .631 OPS over 138 games for the Pirates and Blue Jays last season. He appeared in 15 postseason games for Toronto, with three of his nine starts coming in the World Series.

Kiner-Falefa has primarily been a shortstop and third baseman during an eight-year career. He has been a below-average hitter but performed well defensively.

Marcelo Mayer is expected to play either second base or third for the Red Sox. Kiner-Falefa joins Nate Eaton, Romy Gonzalez, David Hamilton, and Nick Sogard as candidates for either position.

Sources said the Red Sox will continue to seek upgrades to their infield.

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Gasper, 30, becomes the third catcher on the 40-man roster, behind Carlos Narváez and Connor Wong.

Gasper, who has minor league options, is a former standout at Merrimack, N.H., High and Bryant University. He made his major league debut with the Red Sox in 2024, getting into 13 games and going 0 for 18.

Gasper spent last season with the Twins, hitting .158 with two home runs and 11 RBIs in 45 games.

Mickey Gasper made his major league debut with the Red Sox in 2024, getting into 13 games (0 for 18).Danielle Parhizkaran/Globe Staff

The Nationals claimed Gasper off waivers last month but designated him for assignment nine days later. Gasper did not catch for the Sox in ’24 but had 122 innings at the position over 19 games for the Twins last season.

The Sox also have five catchers in camp on nonroster invitations.

The first official workout of spring training for Red Sox pitchers and catchers is Tuesday in Fort Myers, Fla.

Two more outfielders to WBC

Masataka Yoshida was added to Japan’s roster for the World Baseball Classic. He was 9 of 22 with two home runs and 13 RBIs over seven games in the 2023 tournament.

Another Red Sox outfield candidate, Eaton, will play for Great Britain. Eaton appeared in 41 games for the Sox last season and hit .296 with a .731 OPS.

Jarren Duran (Mexico), Ceddanne Rafaela (Netherlands), and Wilyer Abreu (Venezuela) also are committed to the tournament. The trio made up the primary outfield alignment, from left to right, for the Red Sox last season.

Kyle Keller, who spent the last four seasons pitching in Japan, will be in camp as a nonroster invitee. The righthander, who turns 33 in April, had a 5.83 ERA over 44 games for the Marlins, Angels, and Pirates from 2019-21. But Keller had a 2.42 ERA over 158 games for the Hanshin Tigers and Yomiuri Giants working as a setup man. He struck out 177 over 152⅓ innings with 62 walks. Keller’s contract calls for a $1.9 million salary if he makes the major league team, with up to $500,000 in bonuses . . . The Red Sox/Mariners doubleheader scheduled for June 20 has been changed to separate 10 p.m. ET games on June 19 and June 20. June 19 was initially an off day to avoid World Cup traffic, with the United States set to play Australia in Seattle, but that game will be at noon local time, allowing the baseball teams to play at night.

This week we dig into Super Bowl LX preparations and if Drake Maye’s shoulder will be the main storyline of Patriots vs. Seahawks this Sunday.

Peter Abraham can be reached at peter.abraham@globe.com. Follow him on Bluesky at peteabeglobe.bsky.social‬. Tim Healey can be reached at timothy.healey@globe.com. Follow him @timbhealey.