Usain Bolt: Sir Alex Ferguson's retirement was a stressful day

Jamaican sprinter Usain Bolt describes Sir Alex Ferguson's decision to retire as Manchester United manager as a "stressful day".

Bolt adds that with a new manager in charge at Old Trafford, it may now be harder for him to "make the team".

The six-time Olympic champion will compete in Europe for the first time this year when he lines up for the Diamond League's 100m in Rome on Thursday.