O'Hara was in the stands to watch Wolves' FA Cup tie against Stoke after undergoing a medical and the completion of his temporary switch to Molineux was announced shortly after the game.
The 24-year-old had a spell on loan at Portsmouth last season but has not featured at first-team level at White Hart Lane this season because of a back injury.
The former England Under-21 international has featured in two recent full-scale practice matches with Spurs and was eager to go out on loan again in order to regain full match-sharpness.
West Ham were also interested in signing O'Hara but Mick McCarthy has won the battle to secure his services.
Source: PA
Source: PA