Matsuzaka released a statement Thursday saying he spoke with manager Terry Francona and he's resumed his training "in a good state of mind."
Matsuzaka had been quoted as saying the team's throwing program was keeping him from pitching like he had in Japan. The pitcher said in his statement that he never said that. He also said he had no intention of criticizing the team.
Matsuzaka was 1-5 with an 8.23 ERA before going on the 15-day disabled list June 21 with a mild strained right shoulder. Last season, he was 18-3 with a 2.90 ERA.