Kensuke Tanaka (田中 賢介, born May 20, 1981) is a Japanese professional baseball left fielder who plays for the Hokkaido Nippon Ham Fighters of the Nippon Professional Baseball League. He has played for the Hokkaido Nippon-Ham Fighters of Nippon Professional Baseball and the San Francisco Giants of Major League Baseball.

Can we draw the following conclusion?
Tanaka has played for another league other than mentioned. 
It's impossible to say