The Buccaneers signed Gaines (biceps) on Saturday, Tom Pelissero of NFL Network reports.
Gaines recently completed a labral and bicep tendon repair, and he's expected to make a full recovery in approximately two months, Adam Schefter of ESPN reports.
Gaines logged two sacks during Sunday's 27-20 loss to the Saints.
Gaines (elbow) practiced fully Thursday, Adam Caplan of SiriusXM NFL Radio reports.
Gaines (elbow) is inactive Sunday against the Cardinals.
Gaines (elbow) is considered to doubtful for Sunday's game against the Cardinals, Jourdan Rodrigue of The Athletic reports.
Gaines (elbow) was a non-participant in practice Wednesday, Adam Caplan of SiriusXM NFL Radio reports.
Gaines (hand) is active for Sunday's contest against the Ravens, Jourdan Rodrigue of The Athletic reports.
Gaines (hand) is questionable for Sunday's matchup against the Ravens, Kevin Modesti of the Los Angeles Daily News reports.
Gaines (hand) underwent surgery Monday but is still expected to play in Sunday's matchup with the Ravens, J.B. Long of the Los Angeles Rams Radio Network reports.