Napoli have warned Manchester united that only a 'madman' 72million pound transfer offer will prize Argentina striker Gonzalo Higuian away this window,according to the metro website. The 27year-old is a target for the red devils,having scored 18goals in 31 serie A starts last season and he is reportedly ready to end his two year stay with the Italian side. However,club president Aurelio De Laurentiis is adamant that the former Real madrid man will honour his contract,unless a club meets his 72million pound buy-out clause. "The contract will be respected" insisted De Laurentiis. "He will only go if a madman offers his buy-out clause"