Two more former champions, Paul Malignaggi and Zab Judah, have also become notches on Khan's title belt.
"After a sound and fair analysis of the facts contained in the appeal filed by Golden Boy Promotions on behalf of Amir Khan with respect to the outcome of the WBA and IBF world title fight between Khan and Lamont Peterson, the WBA has ordered that an immediate rematch take place within 180 days, " read the statement.
Earl, 29, and British champion Jonathan Thaxton have both been touted to next face Commonwealth title holder Khan.
Gavin, 23, knocked out Graham Fern in his third professional bout on the undercard of Khan's WBA title fight with Andreas Kotelnik on Saturday.
American Patterson went on to win the title and Khan's amazing displays so far have strongly suggested he could win a more precious metal than bronze.
Promoter Frank Warren insisted he will not rush Khan into a world title bout just yet and feels his fighter needs another contest before he goes for the big time.
Amir Khan will defend his Commonwealth lightweight title as he joint headlines the event at Manchester's MEN Arena.
Khan successfully defended his Commonwealth lightweight title for the first time with a fourth-round stoppage against Scott Lawton at the Nottingham Arena on 6 October.
Khan took Limond's Commonwealth lightweight title on Saturday, but he had to pick himself up after a sixth-round knock-down to do so.
Khan says he is fully focused on his title defence against Judah but is already looking ahead to another fight at the end of the year, before moving up a division.
"I didn't really get the chance to get into the fight and to show what I've learnt from Rubio, " Khan, who relinquished his WBO intercontinental lightweight title, told BBC Radio 5 Live.
Gavin is Britain's first ever amateur world champion and he fancies his chances of emulating Khan's success of holding a professional world title.
The Bolton fighter has previously avoided fighting Thaxton when he was made mandatory challenger to the British title, and again when Thaxton was declared the challenger to Khan's Commonwealth belt.
Khan, who was desperate to impress and earn a crack at American WBO title-holder Nate Campbell or interim belt holder Joel Casamayor, said the fight was just what he needed.
Despite the setback, Khan is determined to come back stronger and build his way towards a world title fight and he is eyeing a comeback bout before the end of 2008.
The card also features Amir Khan v Willie Limond for the Commonwealth lightweight crown and Matt Skelton v Michael Sprott for the Commonwealth heavyweight title.
Khan has repeatedly insisted he is ready to step up in quality and progress quickly to a future world title shot, but Earl insists that is looking too far ahead.
Khan faces Denmark's Kristjansen at Bolton Arena on Saturday in a fight that has been billed as a WBO title eliminator.
Khan, 21, linked up with Rubio in July and Prescott was seen as a stepping stone towards a world title fight.
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