In an article published on a Japanese Web site on Monday, Matsuzaka was quoted as expressing frustration with the Red Sox's training program and indicated it was a reason for his lack of success and health this season.
"As for the reports from the past several days, I want to correct some misunderstandings," Matsuzaka said. "I did not go public with any complaints and I regret that some of my private conversations were made public without my knowledge or consent. Also, I never said in public or in a private conversation that: 'If I am forced to continue to train in this environment, I may no longer be able to pitch like I did in Japan.'"
Red Sox manager Terry Francona said that a Wednesday telephone conversation with Matsuzaka -- who is in Fort Myers, Fla., on rehab -- helped ease the tension created by the situation.
In fact, Matsuzaka mentioned the phone call at the start of his statement.
"I spoke to Tito on the phone yesterday, and I'm very glad that we had a productive conversation," Matsuzaka said.
In closing, Matsuzaka expressed enthusiasm about where he and the Red Sox are headed.
"I had no intention of criticizing the team and we are, in fact, working together to communicate, to exchange ideas and to try to understand one another's baseball culture as we move forward," Matsuzaka said. "The team and I have had many meetings and conversations, and after shaking hands with the general manager, manager, and coaches on the 24th [of July], I was able to resume my training in a good state of mind."
Matsuzaka, who is 1-5 with an 8.23 ERA in eight starts, is likely to return to Boston's rotation in September.
"My goal is to put myself into a position where I can contribute to this team," Matsuzaka said. "I look forward to rejoining my teammates and playing in front of the fans at Fenway Park."
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.