He also played in Nippon Professional Baseball for the Fukuoka SoftBank Hawks, and in the KBO League for the SK Wyverns, Doosan Bears, and Nexen Heroes.

The Reds traded Nitkowski, a player to be named later (later selected to be Mark Lewis), and minor-leaguer Dave Tuttle to the Detroit Tigers for David Wells on July 31, 1995.

[4] After the 1998 season, the Astros traded Nitkowski with Ausmus back to the Tigers for Paul Bako, Dean Crow, Brian Powell, and minor-leaguers Carlos Villalobos and Mark Persails.

[4] Late in the 2001 season, the Tigers traded Nitkowski to the New York Mets for a player to be named later, later identified as minor-leaguer Kyle Kessel.

Nitkowski is also a host and analyst for MLB Network Radio on Sirius XM[11] He currently appears on Loud Outs weekdays 3-6PM ET with Ryan Spilborghs and Brad Lidge.

Other analysts he has worked with at FS1 include former MLB players Frank Thomas, Gabe Kapler, Mark Sweeney, Raúl Ibañez, Pete Rose, Alex Rodriguez and Eric Karros.

[12] Nitkowski has called nationally televised MLB games for FS1 and Fox from 2014 to 2019 and has worked with play-by-play men Thom Brennaman, Kenny Albert, Brian Anderson, Len Kasper, Rich Waltz, Justin Kutcher and Tom McCarthy.

Nitkowski, in a statement to the Associated Press (an organization he also occasionally contributes to as a writer) said, "I have never seen Roger or Andy take any illegal performance-enhancing drugs.

[17] In May 2012, Nitkowski was filmed playing the role of former MLB player Dutch Leonard for a scene in the motion picture 42, which chronicles Jackie Robinson's life story.

Coincidentally, the footage was shot in Engel Stadium in Chattanooga, Tennessee, the ballpark where Nitkowski broke into professional baseball as a first-round pick of the Reds in 1994.

[1][18] In 2016, Nitkowski served as a script and technical consultant for Dan Fogelman's Pitch, a television drama about the first woman to reach the Major Leagues.