Norwich City boss Paul Lambert believes there is yet more to come from Grant Holt despite the skipper's recent rich vein of form.

Holt has plundered five goals in his last three games for the club, prompting several Premier League clubs to take an interest in the 29-year-old.

But, after placing a 'not for sale' tag on the striker, Lambert believes the former Shrewsbury man can hit even greater heights with the Canaries this season.

'I hope there's more to come from him,' said Lambert, who is looking to strengthen his squad in the January transfer window. 'He's in a rich vein of form at the minute and hopefully he can sustain that.'

Lambert believes the key to Holt's form has been the fact he has been able to attain full match fitness.

A thigh injury robbed the striker of much of the pre-season but a run of matches has brought the best out him.

'He is getting the benefit of being fit and that's a big part of his game,' added Lambert. 'He needs to maintain that to keep on top of his game.

'He's a heavy made lad and he has to watch what he eats. The make-up of him is that he has to watch what he's doing. If he does that and can keep fit then it's great for everyone at Norwich.'

Holt's goals have helped the Canaries into fifth position in the Championship and with the season set to reach its halfway point following the match on Boxing Day against Crystal Palace, Lambert admitted his side have far exceeded his expectations so far.

'In my view we are punching well above our weight,' he said. 'It's you lads (the press) who think that we should be up there because you haven't had it for five or six years and the last time we were in the Premiership.

'But we've come from League One and we need to consolidate. We need to survive first – you've got to be able to walk before you can run.

'We're playing really well. Fans are coming in their thousands to watch us home and away which is great. But I'm never one to put targets on anybody.'

Lambert won't entertain any talk of promotion in public until Norwich are safe from relegation and he revealed he is looking for his side to get to 50 points as soon as possible.

'If you look at years gone by I think that would be a good mark but you don't know because it depends on other teams,' said Lambert. 'I've said before that we have to try and survive first and foremost.'