Yamato is thinking about exercising the domestic free agent option he earned this year. A number of teams, including Orix, Yokohama, and Yakult, are said to be interested in the twenty-nine-year-old. If he exercises the option, he will most likely be a rank B free agent, which means signing him will require compensation.
Hanshin will try to keep Yamato in a Hanshin uniform by offering a multi-year deal (around three years).
[UPDATE 10/21 @ 12:13am]
The Tigers began discussions with Yamato during the season. They are planning to give Yamato time to figure out what he wants to do. They are also open to signing him even if he exercises his option.
[UPDATE 10/22 @ 11:15pm]
The Tigers are planning to offer Yamato a three-year deal. The Buffaloes and Bay Stars are interested in the twenty-nine-year-old.
[UPDATE 10/26 @ 6:09pm]
Yamato met with Hanshin on October 25. He informed them he was thinking about exercising his free agent option. The Tigers may have in turn offered him a three- to four-year contract.
Source: Nikkan Sports 10/26/2017
[UPDATE 10/29 @ 11:00am]
The Tigers may have offered Yamato a four-year deal.
Source: Sports Hochi 10/29/2017
[UPDATE 10/29 @ 5:16pm]
Yamato is apparently fifty-fifty on staying versus leaving.
Source: Nikkan Sports 10/29/2017
[UPDATE 11/2 @ 3:30pm]
The Buffaloes are interested in Yamato and will consider approaching him if he decides to exercise his option.
Source: Sponichi 11/2/2017
[UPDATE 11/5 @ 12:01pm]
If Yamato decides to exercise his option, the Bay Stars might approach him with a three-year offer.
[UPDATE 11/5 @ 12:18pm]
According to Nikkan Sports, Yamato has informed the Tigers on November 4 that he intends to exercise his free agent option.
Source: Nikkan Sports 11/5/2017
[UPDATE 11/6 @ 3:41pm]
The Tigers may have made Yamato a solid offer, but he wants playing time and could sign with another team if he feels they will give him more opportunities to play. If he decides to leave, his preference might be for a team in the Kanto region. That could put Yokohama in the lead.
The Buffaloes might be preparing a three-year deal worth around 300 million yen (in total).
Hanshin would like Yamato to stay and might make adjustments to their offer if he exercises his option.