The average NFL career lasts just 3.3 years, according to ESPN, and 78 percent of professional football players go broke two years after retirement.

Willie Thomas, a former NFL defensive back who played with the Seattle Seahawks for two years, is part of the 22 percent who has found lasting success off the field. As Managing Director and Market Executive for Merrill Lynch Wealth Management, Thomas focuses on helping today's athletes manage their wealth. The San Francisco-based former athlete tells CNBC Make It that he knows first-hand the financial pressure that athletes face when they first enter the league.