Middlesbrough will sign goalkeeper Joe Lumley when his contract with Queens Park Rangers expires this summer.
Lumley played 84 games for Rangers, conceding 120 goals, and joins Boro on a two-year deal with the option of a further year for both parties.
"I've always rated him highly," Warnock said of Lumley.
"I know he's excited about coming here and he can't wait to play in front of the Riverside crowd."
Boro had Fulham's Marcus Bettinelli and free transfer signing Jordan Archer as senior goalkeepers this season, with Bettinelli having now returned to his parent club.