Manchester United are expected to step up their attempts to secure a pre-World Cup deal for Luke Shaw after confirming Louis van Gaal as their new manager.

Saints are bracing themselves for further pressure from the Old Trafford club, who handed over a £25m offer for the 18-year-old left back just hours after the sides drew 1-1 at St Mary’s on the final day of the season.

There is believed to have been no formal response to the bid with Saints keen to try and leave things to settle while waiting for manager Mauricio Pochettino to decide his future.

The manager has been offered a lucrative contract extension but has stalled on penning the new deal with Tottenham reportedly keen on appointing him as successor to Tim Sherwood.

Saints appear to be trying to hold fire on decisions on Shaw and Adam Lallana, the subject of big offer from Liverpool, until Pochettino’s future is confirmed.

It would make life even tougher for Saints to hold on to Pochettino if they sell from under him, while, in the worst case scenario, if the players were to force moves with the manager having committed himself to a stay beyond the remaining one year on his current deal then the club could say that Pochettino had approved the sales which would make it slightly easier for fans to buy.

United are confident of wrapping a deal for Shaw before he departs with England for the World Cup with current left back Patrice Evra in advanced talks to join Juventus.

The England squad are currently on a training camp in Portugal but return home for over a week of training and a friendly against Peru at Wembley before jetting off to Miami and then Brazil.

Van Gaal’s appointment is likely to be the catalyst for United to try and push the deal.

United executive vice-chairman Ed Woodward said: "In Louis van Gaal, we have secured the services of one of the outstanding managers in the game today.

"He has achieved many things in his career to date and Old Trafford provides him with a fitting stage on which to write new chapters in the Manchester United story."

The vastly experienced Van Gaal was quickly identified as the club's top target after David Moyes was sacked in April.

The appointment of Giggs, 40, ends speculation over the future of the club's most decorated player. Giggs had served as interim manager for the final four games of last season.

Moyes, appointed only last year following the retirement of the long-serving Sir Alex Ferguson, paid the price for a poor season.

United, champions in 2013, could only finish seventh in the Premier League this year and therefore failed to qualify for European football.

Van Gaal will therefore inherit a squad that has slipped to a low ebb but he boasts a rich coaching pedigree and plenty of experience of handling big-name players.

Van Gaal said: "It was always a wish for me to work in the Premier League. To work as a manager for Manchester United, the biggest club in the world, makes me very proud.

"I have managed in games at Old Trafford before and know what an incredible arena Old Trafford is and how passionate and knowledgeable the fans are.

"This club has big ambitions. I too have big ambitions. Together I'm sure we will make history."