Striker boost ahead of Easter double.
The Cardiff City striker was recalled by the Welsh side last month but returns to north Essex ahead of the Easter double against Port Vale and Barnsley.
Boss Tony Humes was delighted to have Healey back with the U's, having thought he would be without him for the rest of the campaign.
"He did well for us and knows exactly what we require here so it was an easy decision to get him when it became a possibility."
"It can never do a side any harm to have extra attacking options and Rhys gives us exactly that."