Transfer News: Manchester United Set to Complete First Signing of Summer as Spurs Line Up Shock Bid for Gareth Bale

Manchester United's season ended without a trophy and Jose Mourinho is not wasting any time to ensure his side closes the 19-point gap that separated it from Premier League champions Manchester City.

According to multiple reports, United will make Porto starlet Diogo Dalot its first signing of the summer. The 20-time champions of England have reportedly agreed to activate the $23.1 million clause in the right-back's contract.

The 19-year-old, who only broke into the Porto first team this season, has allegedly already agreed personal terms with United and the transfer should be completed within the next few days and his arrival will in all likelihood see Matteo Darmian and Daley Blind leave the club during the transfer window.

Dalot will not be the only new face at Old Trafford this summer and the Telegraph suggests United is closing in on a deal to sign Brazil international Fred from Ukrainian club Shakthar Donetsk for $58.4 million and remain keen to bring Tottenham Hotspur centre-back Toby Alderweireld to Manchester.

United is also keeping an eye on Gareth Bale, whose agent is due to hold official talks with Real Madrid in the coming days. According to Spanish newspaper AS, United is considering a bid in the region of $159 million for the Champions League hero. However, Mourinho could have to fight off competition from Spurs, who the Independent suggests might make an "audacious" attempt to bring the Welshman back to north London.

While Tottenham can't match United's financial power, Bale is said to be "open to a return and willing to make compromises on financial demands."

According to the Daily Mirror, meanwhile, Spurs are also keeping tabs on Southampton goalkeeper Alex McCarthy, as a possible understudy for Hugo Lloris.

A winger who will certainly move to Manchester is Riyad Mahrez, who is set to swap Leicester City for the newly-crowned champions of England. The Express believes the Algerian will complete his move to Manchester City for around $100 million by the end of the week.

In Manchester, Mahrez will play alongside Phil Foden, with the Telegraph reporting City will not send the teenage midfielder out on loan next season.

Another promising teenager, Fulham's Ryan Sessegnon, also looks to be staying put. The 18-year-old was an instrumental figure as the Cottagers secured a return to the Premier League and has been linked with a host of Premier League clubs, including Spurs.

However, according to the Evening Standard, Tottenham is worried Fulham would be reluctant to do business as its owner Shahid Khan has recently bid to buy Wembley Stadium and could make the venue the permanent base of his Jacksonville Jaguars team.

Spurs' soon-to-be-completed new ground will also host NFL next season and chairman Daniel Levy is worried a tug-of-war to become London's home of NFL could hamper his club's chances of landing Sessegnon.

On the other side of the North London divide, the Mirror reports Arsenal is looking to complete deals for Borussia Dortmund centre-back Sokratis Papastathopoulos, Juventus' full-back Stephan Lichtsteiner and Freiburg defender Caglar Soyuncu before the World Cup begins.

The same paper also suggests Aaron Ramsey will stay at the Emirates Stadium as reportedly "can't wait" to work with new manager Unai Emery and that the Gunners will trigger the $29 million release clause of Sampdoria midfielder Lucas Torreira.

Elsewhere, the Express suggests Chelsea's hopes of appointing Maurizio Sarri as its new manager have been dealt a serious blow as Napoli want the Blues to pay the full $9.3 million release clause for its former manager.

Meanwhile, Liverpool's quest to upgrade its goalkeeping options could cost the club a world-record fee, with the Guardian reporting Roma will demand $106 million for Brazil international Alisson.