NFL's Justin Pugh -- Hey Rookies ... DON'T BLOW YOUR MONEY!!

NFL lineman Justin Pugh knows what it's like to become a MULTI-MILLIONAIRE overnight ... and he's got some excellent advice for the new rookies to make sure they don't go broke.

For the record, Pugh signed an $8.3 MILLION contract with a $4.4 million signing bonus when the NY Giants selected him in the 1st round of the 2013 draft.

So, what's the secret to financial success for the young guys? Pugh says there's one KEY MOVE they need to make right away ... before they start living the good life.