The Titans have agreed to terms on a six-year, $46.8 million deal with their top free agent target, Bills guard Andy Levitre.

Shortly after the NFL's free agency period began at 3 p.m., the Titans also agreed to terms with 49ers tight end Delanie Walker.

The Titans also lined up a Wednesday visit with Lions defensive tackle Sammie Lee Hill, and have expressed interest in Rams wide receiver Danny Amendola.

Upgrading the interior offensive line was a priority for the Titans this offseason, and Levitre, 27, should be a good start.

The 6-foot-2, 305-pounder had 64 straight starts over the past four seasons with Buffalo and was considered the top free agent guard.

Walker, 28, is coming off his seventh NFL season, all with the 49ers. Last year for the NFC champions, the 6-foot, 242-pounder had 21 receptions for 344 yards and three touchdowns.