As far as Kell Brook is concerned, his animus for Amir Khan is back in full force.

British welterweights Brook and Khan were bitter rivals throughout their careers, but they made peace after their highly anticipated showdown one year ago in which Sheffield’s Brook stopped Bolton’s Khan in six rounds.

Yet it appears their bonhomie will no longer be mutual, as it was revealed by United Kingdom Anti-Doping on Tuesday that Khan had tested positive for a banned performance-enhancing drug in a test that was administered after his fight with Brook last year. UKAD slapped Khan with a backdated two-yearn ban, meaning he will be barred from fighting until next April. However, Khan is retired, and he reiterated on Tuesday that he has no intention of fighting again.

The banned substance in question is ostarine, an anabolic agent.

Khan has accepted the results, but he has maintained that he must have ingested the drug unwittingly. The UKAD investigation concluded that Khan did not deliberately take the drug. It also asserted that the amount found in Khan’s body was too minuscule for the fighter to reap a benefit.

Now Brook wants more than just a suspension levied on Khan; he wants his adversary to be punished financially.

“Just ‘cause he’s retired doesn’t mean that I’m out of the game,” Brook told iFL TV. “At the end of the day, he was cheating. [Khan is] going to have to pay a hefty fine so that it’s a thing where fighters shouldn’t even think about doing.

“Of course, he should be paying for this. At the end of the day, as much as this is bad publicity for him, he needs to pay financially. He needs to let everyone out there you can’t just fight and then get caught and you’re retired that there is no punishment. Of course, he should.”

Brook was not convinced by Khan’s alibi that the drug entered his body by accident.

“It’s the same thing with anybody that’s been caught: they didn’t know, it was this, it was that,” Brook said. “But at the end of the day it was in you. You got in that fight with a drug to enhance you and hurt me in a sport where legally you can get killed in. It’s not about, 'you didn’t know.' It’s in your system.  You know exactly [that] it’s in your system. You got in there with bad intentions to hurt me bad, to win the fight at all cost, which has come back and bit him in the ass bad. 

Brook said Khan deserves to live out the rest of his life with people questioning the merits and achievements of his career.

“He’s going to have to live with that,” Brook said of Khan now having to deal being branded a drug chat. “People are going to think how long has he been on these drugs. Of course it’s going to tarnish his career. Imagine if he wasn’t on them drug, he would’ve gone out probably in the first round (of our fight).

“He was the one that was saying drug test me,” Brook added. “I’ve lost count how many times I was drug tested in that fight. And all along it were him that were doing the cheating in there. It’s a f------ joke.”

Brook has hinted at a ring return later this year. He has also been mentioned as a potential opponent for drug embattled welterweight Conor Benn, who is reportedly set to fight for the first time in over a year on June 3 in Abu Dhabi.