In the RaboDirect PRO12 this season, the pair have shared the duties - Healy featuring three times and 24-year-old McGrath making six appearances, scoring one try.
And Healy has revealed how it has been a two-way street between the two in training for both club and country.
"It's been great watching Jack because when he got included he just constantly plugged away and has been working on the finer details," said McGrath.
"He has constantly plugged at it, wants to learn and is always asking for stuff.
"When we are put together in the gym or we are with each other in scrummaging, we're tagging in and out.
"We are constantly learning off each other. It is not like I'm not learning anything off him as well.
"We are bouncing things off each other and what to do different weeks in and out.
"It's a nice little team we are getting up."