The former Northampton Town manager is expected to renew his bid to sign Mark Bunn, having made a number of offers for the Cobblers goalkeeper earlier this season.
Forest played much of last season without adequate cover for first choice keeper Paul Smith and on many occasions played without a keeper on the bench.
Calderwood says he hopes to rectify this over the summer, saying: "I think it's something we've got to look at.
"We've got Paul Smith and three youngsters in Dale Roberts, Paddy Gamble and Shane Redmond. We'll need a more experienced keeper to a degree and we need someone to put Paul Smith under a bit more pressure."
Cobblers chairman David Cardoza revealed to the Chronicle & Echo that Calderwood had already made six bids for Bunn, but none matched the club's valuation.
Cardoza: Forest have made about six bids for Bunn - click hereThe full article contains 177 words and appears in n/a newspaper.
