Manchester United have made a first offer for Atletico Madrid fullback Kieran Trippier.

Football Insider reports United have submitted an opening bid for Trippier, but it has been rejected by Atletico Madrid.

A source suggests United offered roughly £10million for the right-back.

However, in Spain it's suggested Atletico are demanding closer to £35m to sell Trippier.

The England international is regarded highly by Atletico coach Diego Simeone, who is reluctant to lose the defender.