There are 3 Japanese MLB players played for the Montreal Expos

Tomokazu
Ohka

RHP Boston Red Sox

(Boston Red Sox , Montreal Expos, Washington Nationals, Milwaukee Brewers, Toronto Blue Jays, Cleveland Indians, Yokohama DeNA BayStars)

大家友和 (おおか・ともかず)

Bats: S Throws: R

Current Age 45

6-1, 205lb (185cm, 92kg)

MLB Debut:
1999-07-19 (23)

Masato
Yoshii

RHP New York Mets

(New York Mets, Colorado Rockies, Montreal Expos, Osaka Kintetsu Buffaloes, Tokyo Yakult Swallows, ORIX Buffaloes)

吉井理人 (よしい・まさと)

Bats: R Throws: R

Current Age 56

6-2, 210lb (188cm, 95kg)

MLB Debut:
1998-04-05 (32)

Hideki
Irabu

RHP New York Yankees

(New York Yankees, Texas Rangers, Chiba Lotte Marines, Hanshin Tigers, Montreal Expos)

伊良部秀輝 (いらぶ・ひでき)

Bats: R Throws: R

Current Age 42

6-4, 240lb (193cm, 108kg)

MLB Debut:
1997-07-10 (28)