Injury and suspension problems have meant that Frank Fielding and Adam Legzdins have both had runs in the team this season.
Fielding, first choice for the majority of last season, also began this campaign as number one before suffering a groin injury at Middlesbrough in October which opened the door for Legzdins to make 30 consecutive starts.
Legzdins was then replaced at the start of March, but a red card for Fielding in the home victory over Peterborough on April 20 gave him another chance.
Both keepers are about to enter the final year of their contracts and Clough admits he faces a tough decision about what to do.
"The goalkeeping department is an area we are looking at, certainly. We have got contract issues there," said Clough.
"They have both got a year left so that needs sorting one way or another, first of all.
"It is the same with any player who has a year left, they either sign another contract or they go. We cannot let them go into their final year.
"I don't know whether we are lucky or unlucky in the respect that we have two very good goalkeepers who are both number one's really."