Kell Brook has warned Amir Khan that he has made a "big mistake" by inserting a catchweight of 149lbs into the contract for their grudge match.
The Sheffield Star will look to finally settle his rivalry with his long-term foe in Manchester this weekend after the pair finally agreed a bout.
Brook has admitted previously he struggles to make the welterweight limit of 147lbs which raised question marks over whether he would be at his best in their illustrious meeting.