By Edward Chaykovsky

Amir Khan (31-4, 19KOs) feels that his domestic rival, IBF welterweight champion Kell Brook (36-0, 25KOs), made the wrong decision by bulking up in weight for the upcoming showdown with IBF/IBO/WBA/WBC middleweight champion Gennady 'GGG' Golovkin (35-0, 32KOs).

Khan is very intimate with the procedure of moving up in weight to challenge a bigger opponent. This past May, he jumped from 147 to a catch-weight of 155-pounds, to face Saul 'Canelo' Alvarez for the WBC middleweight title. Khan started off well, using his speed and movement, but he was brutally knocked out in the sixth round.

Brook has packed on some muscle and sculpted his body for the upcoming contest, actually outweighing Golovkin during the WBC's 30 day and 7 day weight checks. Brook was 176 pounds at the 30 day mark, while Golovkin was only 165. Brook was nearly 168 at the 7 day mark and Golovkin was 162.

Khan believes the extra weight is going to make Brook less mobile, forcing him to stand and trade with a huge puncher who stopped his last 22 opponents inside the distance.

"I think Brook is small for the weight going in. But even though he's been weighing in heavier than Triple G.... Triple G weighed in at 162 I heard and Brook I heard was almost 168, so he's already a lot heavier than him. But will that be a downfall? I think time will tell," Khan said.

"I think maybe he's taking the wrong approach for the fight by being heavy. Naturally, if he would been a naturally lighter guy he could have moved quicker but if he's going to stand there with a big puncher I think he's going to get hurt."