By Michael Campbell and Michael Doss

WBO/WBA/IBF lightweight champion Juan Diaz (33-0 17KOs) has reunited with trainer Ronnie Shields.

Shields told BoxingScene.com that he will train Diaz for the February 9 showdown with WBO mandatory Michael Katsidis (23-0, 20KOs).

Shields was previously let go by Diaz, for choosing to train Evander Holyfield for the title bout with Sultan Ibrgamiov, instead of preparing Diaz for his unification bout with Julio Diaz.