Watkins signed a reserve/future contract with the Buccaneers on Monday, Scott Smith of the team's official site reports.
Watkins was with the 49ers in training camp before being let go at roster cutdowns while dealing with an injury, though he eventually rejoined the team for a three-week stint on the practice squad in November. The rookie UDFA out of UAB will attempt to take advantage of Tampa Bay's offseason program to potentially make his NFL debut in 2022.