Heath (striker) and Heaton (goalkeeper) trained with Swindon on Wednesday, but King will discuss the deal with United manager Sir Alex Ferguson on Thursday.
Heath had a loan spell at Cambridge last season.
Swindon boss eyes Man Utd duo
Heath (striker) and Heaton (goalkeeper) trained with Swindon on Wednesday, but King will discuss the deal with United manager Sir Alex Ferguson on Thursday.
Heath had a loan spell at Cambridge last season.