New Newcastle defender Davide Santon is set to undergo surgery after his knee problems flared up again.
• Santon joins Newcastle
Santon, 20, has yet to make an appearance for Newcastle after joining from Inter Milan on August 30, but he is now facing at least four weeks on the sidelines after a cartilage problem flared up again during training.
"It's a worry," manager Alan Pardew said. "It looks like it could be a cartilage and it's not something you want when he's just come into the building. Maybe we're looking at a month out.
"He's going to have to get it cleaned out - it's keyhole surgery nowadays which is a quicker operation but it will certainly mean at least four weeks out."
Santon has had two previous operations on the problem in the past two years but Pardew says his medical at St James' Park was adequate.
"Davide has had a few injuries in the last couple of years which isn't ideal," he said. "He's been through a really thorough medical and he's a little bit unlucky as we're only a week or so on from the medical. He trained today and trained well. It was just when he came off, he complained a little bit and we're erring on the side of caution with him."