LOUIS REES-ZAMMIT is determined to make the Kansas City Chiefs’ playing roster after admitting his NFL dream could be over in a heartbeat.

The former Wales rugby star returned to the US on Wednesday to begin pre-season training after signing a three-year contract with the back-to-back Super Bowl champions.

However, Rees-Zammit is only guaranteed to be paid for the first year and has revealed that if he fails to impress, he can be jettisoned immediately.