Martin O'Neill confirms Bendtner may return to the squad shortly if he can start to get his confidence back after his facial injury.
Sunderland boss Martin O'Neill in January confirmed striker Nicklas Bendtner's facial injuries are worse than was first thought.
The Denmark international suffered a broken nose when he was caught in the face by Swansea defender Angel Rangel's boot during Saturday's 2-0 Barclays Premier League victory over the Welsh side.
However, O'Neill has revealed that the damage is more extensive and as a result, Bendtner is likely to miss several games, starting with Sunday's FA Cup fourth round clash with neighbours Middlesbrough.
He told the Sunderland Echo: 'He's got a bit more than a broken nose.
'It's difficult to put a timescale on it, but it's going to be lengthy.
'We thought at one stage he might be okay. The early signs, even on Sunday morning, were that it looked as if it might be okay.
'But he's going to be out for a number of weeks now, which is definitely a blow to us. He has a few cracks and we just have to bide our time with that.
'That's a big blow to us and to the lad himself, who was beginning to enjoy a decent spell of football for us.'
Teenager Connor Wickham took Bendtner's place against the Swans, while Ji Dong-won was among the substitutes and Fraizer Campbell is close to a return after his latest knee injury.
However, O'Neill is understood to have a interest in Bolton's Kevin Davies as the winter transfer window enters its final few days, although the Trotters have indicated they are not interested in a loan deal.
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