Northern Ireland manager Nigel Worthington believes it was right and proper that striker Kyle Lafferty returned to Rangers for treatment on his knee injury.

Lafferty indicated on Monday he might be fit to face Slovakia in a World Cup qualifier at Windsor Park on Wednesday, but the Northern Ireland medical staff thought it was too much of a risk - and the player headed back to Ibrox on Tuesday.

Boss Nigel Worthington said: "Kyle has gone back to Glasgow. It would not be right for him to be tested, or Rangers. It would have been unfair on them and ourselves."

He added: "He will have on-going treatment, and we hope he will be fit in a few weeks.

"We have lost Lafferty and (Warren) Feeney at the same time. But I do not think about the ones going out - only the ones coming in."

Worthington looks likely to start against Slovakia with the team that finished in Poland, Martin Paterson partnering David Healy in attack.

Paterson squandered a couple of good chances at the Slaski Stadium - but according to the manager, that is par for the course.

Worthington said: "Martin Paterson does not have to bounce back. Martin can miss as many chances as he wants, as long as works hard for the team.

"If he does that I will always have time for him - and the other bit will come. To go and miss a chance is part and parcel of being a striker."

Chris Brunt and Chris Baird are both available again, after being ruled out against Poland through suspension and injury respectively.