Manchester United are quickly realising that their pursuit of Tottenham Hotspur midfielder Eric Dier could end in failure as the club has no intention of allowing the midfielder to leave the outfit this summer.

Jose Mourinho has identified Dier as a key signing to stabilise his midfield ahead of next season, and according to the Mirror, the Red Devils are willing to spend around £40m ($51.5m) to sign the former Sporting Lisbon star.

Dier could easily double his reported £50,000-a-week wages if he moves to United, but Spurs have no intention of letting the player leave. Moreover, the club will hold the cards in terms of his future after he agreed a new five-year deal eight months back.

According to the London Evening Standard, Mauricio Pochettino still considers him an important part of the squad and will not allow him to join a direct rival. Dier joined Tottenham as a defender before he was converted to a defensive midfielder by the Argentine manager last season.

The 23-year-old is keen to play in midfield but has lost his place in the squad with the manager preferring the pairing of Victor Wanyama and Mousa Dembele at the moment. Despite his omission from the midfield, Dier has made 43 appearances in all competitions mainly playing as a third centre-back in Pochettino's new 3-4-2-1 formation.

Eric Dier
Eric Dier has lost his place in the Tottenham midfield to Victor Wanyama this season Reuters

Mourinho sees the midfielder as a potential long-term replacement for Michael Carrick, who could leave once his contract expires at the end of the current campaign. However, Daniel Levy has made it clear during a meeting with the Tottenham Supporters Trust that the club have no intention of selling any player for non-football reasons this summer, while also stating that players will not be handed improved deals if they have existing long-term deals.