The two are recovering from injuries, and Pearson does not want to push them too hard too soon.
Welbeck has been out since a hamstring problem he picked up in October, while Cleverly suffered a foot injury around the same time.
"Danny is back out on the grass so he is making good progress," said Pearson to reporters.
"Cleverley is still a while away. I don't want to put a time frame on that. When he is back, I want him back for good.
"I don't want to put players at risk just for the sake of another couple of weeks. I want to make sure they are absolutely right."