Nicolas Gaitan will cost any interested clubs £21million according to recent reports.
According to the Daily Mail, Benfica have valued the 27-year old attacking midfielder at the aforementioned amount as top European clubs begin to circle.
Liverpool are believed to be showing significant interest in Gaitan while Manchester United have long been linked with the Argentine.
Gaitan joined Benfica from Boca Juniors for £6m in 2010 and he has gone onto make over 200 appearances for the Portuguese giants while winning the past two Primeira Liga titles and twice being runner-up in the Europa League.