Olympic superstar Usain Bolt will not play in Rio Ferdinand's testimonial at Old Trafford next month, according to the sprinter's agent.
Ricky Simms told NBC Sports that Bolt would have liked to play in the fixture, but track commitments will prevent him from making an appearance.
The testimonial will kick off at 19:30 on August 9th, but Bolt has a first-round 100m heat in the World Championships in Moscow the following day at 17:30.
The four-hour flight from London to Moscow wouldn't be a problem, but Bolt wouldn't want to play a match less than 24 hours before competition.
The Jamaican sprinter is a huge Manchester United fan, and attended a match at Old Trafford early last season shortly after the London 2012 Olympics.
Ferdinand's testimonial will see Manchester United take on Sevilla after the club's world tour.
The 34-year-old centre-back joined United in 2002 from Leeds United, and has gone on to make almost 300 Premier League appearances for the club.
He's won six league titles, two League Cups, and one Champions League in his 11-year career at the club so far.