The Boston Red Sox could be on the verge of another blockbuster free agent signing.

Jon Heyman of CBS Sports reports the team has agreed to a five-year, $100 million deal with San Francisco Giants free agent third baseman Pablo Sandoval.

Sandoval, 28, is fresh off of a third World Series in five seasons with the Giants. The 2012 World Series MVP, the Venezuelan had another impressive postseason this past October in the Giants' seven-game win over the Kansas City Royals, batting .429 in the Fall Classic. In three World Series, Sandoval has a .426 average.

Thought not as impressive as his playoff numbers, Sandoval, a two-time All-Star, hit .279 with 16 homers and 73 RBI over 157 regular season games in 2014. He also possessed the fifth-best range factor of any NL third baseman per nine innings.

There is some confusion over whether or not the deal with the Red Sox is complete. Giants vice-president Bobby Evans told KBNR in San Francisco on Monday morning that he had spoken to Sandoval's agent, his brother Michael, and "he's vehemently denying the [Red Sox] reports." FOX Sports' Ken Rosenthal reports that the San Diego Padres, another suitor of Sandoval's, indicate that they have yet to be told that they are out on the player. While it does not happen in every case, it's common practice for a free agent to inform potential suitors that he has chosen to sign with another club.

If the Red Sox do, in fact, capture Sandoval, he will be the second high-profile free agent headed to Boston. Reports on Monday also have Los Angeles Dodgers free agent shortstop Hanley Ramirez returning to the Red Sox, the team that drafted him, on a five-year, $90 million pact.