Reinier was loaned to Frosinone. He played 1,108 minutes, scored three goals, and experienced a relegation.

Reinier was loaned to Frosinone on the last day of the transfer window after a summer with no offers. He played 23 matches and scored three goals, but the team was relegated.

Reinier Jesus had a failed loan attempt at Frosinone, which was one of his four consecutive seasons on loan.