Thirty-three-year-old Yoshihisa Hirano is in the final year of a three-year contract. He has an international free agent option. The Orix Buffaloes have already reached out to Hirano to let him know that they want him back next year.
Source: Nikkan Sports 9/8/2017
[UPDATE 9/11 @ 12:58pm]
Scouts from a number of MLB teams, including the Blue Jays, Diamondbacks, Cardinals, and Mariners, have been spotted at Orix games since the beginning of September.
Source: Daily Sports 9/11/2017
[UPDATE 9/28 @ 11:19am]
The Red Sox and Cubs may be interested in Hirano. An unnamed NL scout told Sponichi that Hirano was a good pitcher that could handle the seventh and eighth innings and would be worth a multi-year deal.
Source: Sponichi 9/28/2017
[UPDATE 10/1 @2:24am]
Hirano is planning to select John Boggs as his agent.
Source: Sponichi 9/30/2017
[UPDATE 10/5 @ 5:31pm]
The Cardinals may also be interested in Hirano.
Source: Sponichi 10/5/2017
[UPDATE 10/8 @ 4:46pm]
Hirano is planning to exercise his option. He will either stay with Orix or head overseas. The Red Sox, Cardinals, and Cubs are among teams that might be interested in his services.
[UPDATE 10/10 @ 12:21am]
Hirano is planning to travel to the United States to check on various facilities. He will most likely be represented by John Boggs.
[UPDATE 10/18 @ 1:38am]
Hirano returned from a trip to the United States on October 16. He spent three days in the US and watched Game 1 of the Cubs-Dodgers game on October 14.
Source: Sports Hochi 10/17/2017
[UPDATE 10/19 @ 6:00pm]
Hirano told reporters on October 18 that it would not take him long to decide what to do with his free agent option if there were MLB clubs interested in his services. He seems to want to play on the West Coast.
[UPDATE 10/22 @ 11:46pm]
Hirano is scheduled to meet Orix officials some time later this month. He is planning to wait for offers from MLB teams before making a decision about his option.
Source: Daily Sports 10/22/2017
[UPDATE 10/25 @ 3:33pm]
The media learned on October 24 that Hirano received contract terms from the Buffaloes for the first time during negotiations so far. Orix is trying to get him to stay with a multi-year contract. Hirano told reporters he felt he got a fair offer from the team.
Source: Sports Hochi 10/25/2017
[UPDATE 10/26 @ 6:05pm]
The Buffaloes may have offered Hirano a three-year contract.
Source: Nikkan Sports 10/26/2017
[UPDATE 10/28 @ 5:00am]
The Buffaloes may have offered a two-year deal worth about 600 to 700 million yen.
Added a range based on Sports Hochi article on 11/8
[UPDATE 11/7 @ 1:25am]
The media learned on November 6 that Hirano is planning to file for free agency on November 7.