What TOM CRUISE and DAVID BECKHAM are hiding about their hush-hush bromance!  AFTER hanging up his cleats, soccer superstar David is hoping to net a big movie career with help from his pal Tom!

The ENQUIRER has learned that Cruise once offered to turn the heartthrob athlete into a big-screen action hero – and now that Beckham has announced his retirement from the sporting life, a source says he’s ready for Tom to make good on his promise.

Beckham, 38, has been commuting between his Los Angeles home and Europe to fulfill a five-month soccer contract with the Paris Saint- Germain team, but the source says now that it’s over he’ll pursue his lifelong ambition to be an actor.

“David has always wanted to be an action film star, and Tom promised him a long time ago he can make those dreams come true,” revealed an insider. “David still loves soccer but feels he’s gone about as far as he can in the sport and that now is a great time to transition into film while he’s still young enough to land top-notch roles.”

The soccer icon and “Mission: Impossible” star met several years ago when David’s wife, Spice Girl Victoria, began hanging out at fashion shows with Tom’s then-wife Katie Holmes.

But the couple’s friendship apparently ran into problems.

“David and Victoria distanced themselves after Tom began trying to sell them on the idea of Scientology,” said the insider. “But David still kept in touch with Tom and believes he’ll stand by his promise to help him become an action star.

“Who knows? We could see David in ‘Mission: Impossible 5.’”