It was an eventful cameo from the Irish star who tasted the highs and lows of football in just 10 minutes on the pitch.
He came off the bench immediately after Middlesbrough's equaliser, drove home the decisive goal from 25 yards just three minutes later and then hobbled off after appearing to twist his left knee as he chased a ball down the left touchline. He signalled straight away to the bench after the incident.
Martin Jol reported on Tuesday night: "He will have a scan in the morning, as normal, and hopefully he'll be okay because it will be a shock for us if he's badly injured."
Robbie Keane will undergo scans on Wednesday to determine the extent of the knee injury he suffered after blasting the winner against Middlesbrough.