The two actors - who recently became friends after realising they are both motorcycle enthusiasts - speak regularly, with Hollywood legend Tom becoming the younger star's "professional and personal guru".
A source said: "Tom and Zac clicked the minute they met.
"Now, when Zac gets a script to consider, his first call is to Tom. Tom warned Zac to diversify and not get pigeon-holed in one type of role."
The source explained to National Enquirer magazine: "Zac is extremely shrewd, but he considers Tom a personal and professional guru."
"Tom also warned Zac how to conduct himself in public."
The pair are enjoying their bonding sessions so much, they are even considering working on a new movie together.
The source added: "They've even talked about teaming up on a film together - the way Tom did with Paul Newman I the 1986 film 'The Colour of Money'."
An enjoyably freewheeling tone and Tom Cruise's star wattage combine to make this an entertaining...
To launch their new Dark Universe franchise, Universal has taken an approach that mixes murky...
During a deadly military operation in Egypt, an explosion uncovers an overwhelming secret buried in...