Boxer Haroon Khan tweeted that his brother "will be back" after suffering a second defeat against Danny Garcia in Las Vegas.
Amir Khan has been defeated by Danny Garcia in Las Vegas.
Referee Kenny Bayless stopped the fight for the light-welterweight title in the fourth-round after a series of heavy blows by Garcia.
The 24-year-old American paid tribute to his family in his post-victory speech.
Amir Khan's fight against Danny Garcia has started in Las Vegas.
British boxer Amir Khan's bout against American Danny Garcia is expected to start at approximately 04:00 BST today.
The light-welterweight unification fight will take place in Las Vegas.
David Haye has defeated Dereck Chisora in their heavyweight fight tonight at Upton Park.
The 31-year-old Briton won by TKO in the fifth round.
The David Haye v Dereck Chisora fight is now underway.
Earlier, former Olympic champion Audley Harrison and former undisputed super-middleweight world champion Joe Clazaghe tweeted the following predictions:
Floyd Mayweather is currently serving a prison sentence for domestic violence and Khan will be waiting when he is released in a few weeks' time.