The Giants transferred Tidwell (elbow) to the 60-day injured list Thursday.
Tidwell is likely to require Tommy John surgery after suffering a high-grade UCL sprain during his last outing Monday, so the Giants will stash him away on the 60-day IL for the rest of the season. His 40-man roster spot will go to Camilo Doval, who was claimed off waivers from Pittsburgh on Thursday.