Martin, a free-agent, was reportedly offered a multiyear deal during the season, but no agreement was reached. Martin hit .290 with 11 home runs, 67 RBIs and a .402 on-base percentage while throwing out 37 base runners this season.
The Pirates lost to the San Francisco Giants in the NL Wild Card game after going 88-74 and finishing second to the St. Louis Cardinals in the NL Central. Pittsburgh's 2014 payroll, $77 million, was the highest in the team's history, but just 27th in Major League Baseball.
Martin, 31, signed a two-year, $17 million contract with the Pirates in November 2012. During his nine-year career, Martin has hit .259 with 119 home runs, 540 RBIs and a .354 on-base percentage.
According to Heyman, the Los Angeles Dodgers, with whom Martin spent his first five years in the league, could be interested in signing him, as well as teams seeking a catcher, including the Texas Rangers and Chicago Cubs.