Brook has made no secret of the fact that he is struggling to make the welterweight limit at 30 and would like to move up to 154lb .
Brook still holds the International Boxing Federation 147lb welterweight crown .
Brook , who still holds the International Boxing Federation 147lb welterweight crown , has made no secret of the fact that he is struggling to make the welterweight limit at 30 and would like to move up to 154lb .