According to the Boston Globe, the Red Sox offered a five-year, $95 million deal. Shea has heard the Padres' offer is the highest, but Sandoval is leaning toward accepting Boston's deal.
The 28-year-old has spent his entire seven-year career in San Francisco and won three World Series there.
Giants assistant GM Bobby Evans said he thinks the interest Sandoval has in the Giants is "sincere."
"I think Pablo loves this fan base as much as any player loves a fan base and that could go a long way," he said.
A two-time All-Star, Sandoval batted .279 with 16 home runs and 73 RBI in 2014 and has a lifetime .294 average with 106 home runs and 462 RBI.
- Molly Geary