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'."
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