Boxingtalk just spoke with former world light heavyweight champion Glen Johnson, who has been proposed as the opponent for Joe Calzaghe when the reigning world super middleweight champion makes his HBO decut in July. According to Johnson, the neogtiations have reached an impasse over the issue of the contracted weight limit for the fight.Johnson informed Boxingtalk that although Calzaghe had offered Johnson a fight, the offer was unacceptable because Johnson would have had to come down in weight too much to take the offer seriously. Johnson said he counter-offered a different catchweight to Calzaghe, but neither side could agree. Boxingtalk will continue to stay on top of this story as negotiations are likely to continue.