Cunha confirmed to TMW that United have offered €35 million for the midfielder and hints they're the only club currently in negotiations.
"Manchester United have made a very important proposal, exactly equal to €35 million. They should offer a few more. For me, there is only Lucas after Neymar and we do not want to sell.
"Why should we deprive ourselves? We do not need the money - the Brazilian economy is fine, the tv pay us and we cannot complain.
"Better to have a great player than cash in the bank."