Portuguese giants Benfica will only let young gun Axel Witsel leave for £31million says club president Luis Felipe Vieira.
The 23-year old Belgian midfielder has recently attracted interest from Manchester United and AC Milan but Vieira says it will take a very big bid to meet his release clause and pry him away from Estadio da Luz.
"Every club knows what his release clause is," Vieira told Antena 1. "If they come here and pay that fee, then there is nothing that we can do.
"We are very happy with Witsel and we do not think about selling him."