Varejao, who played 43 minutes in Sunday's overtime win over Memphis, has a sore back. An MRI on Monday showed no structural damage. Varejao, who has also been playing with a sore left knee, is averaging 10.3 rebounds and 8.8 points.
Varejao appeared in only 81 games the past three seasons because of injuries. He has missed four games this season.
Miles, who is averaging 10.3 points, injured his right foot Sunday. X-rays Monday were negative.
Both players are day to day. Cleveland plays its final game before the All-Star break on Wednesday at Detroit.