Walker suffered a serious ankle injury on Sunday and reports since then made it clear that he was very likely done for the season, so this doesn’t come as a big surprise.
Walker, 34, is a former seventh-round pick of the 49ers back in 2006. He spent seven years in San Francisco before signing on with the Titans for the 2013 season.
Walker was entering the final year of his three-year, $19.075 million contract when he agreed to a two-year, $17 million extension that includes an $8 million signing bonus and $12.76 million guaranteed this past July.
In 2017, appeared in all 16 games for the Titans and recorded 74 receptions for 807 yards receiving (10.9 YPC) and three touchdowns. Pro Football Focus had Walker rated as the No. 4 overall tight end out of 71 qualifying players.
Pruitt, 26, is a former fifth-round pick of the Vikings back in 2015. He spent over a year in Minnesota before he was cut loose at the start of the 2016 season.
Pruitt had brief stints with the Bears and Bills before joining the Texans last year. Houston waived Pruitt coming out of the preseason before re-signing him to their practice squad last week.
In 2017, Pruitt was active for one game but he did not catch a pass.