The official website for the anime Free! confirmed that voice actor Tatsuhisa Suzuki will continue to voice the character Makoto Tachibana. Suzuki is also the vocalist for the band OLDCODEX, which contributed several theme songs to the franchise.
Suzuki's agency announced on August 4th that he would be taking a hiatus from entertainment industry activities due to his declining health. The production committee, the production team, and Suzuki's agency held several deliberations regarding the best options for all the fans and the franchise itself.
The production committee added that Makoto Tachibana has been a crucial character for the franchise since its planning stages nine years ago. Finally, the committee concluded by asking fans for their continued support.
Source: ANN