The summer transfer window has now begun, with rumours and speculation continuing to swirl as Manchester United eye possible reinforcements.

The Red Devils brought in Bruno Fernandes and Odion Ighalo in the final days of the winter window but are still expected to be active in the summer as they aim to restore their former glories.

Here, Sports Mole rounds up the latest news on possible comings and goings from Old Trafford.

Monday morning's Manchester United transfer talk news roundup:

Manchester United 'on alert as Douglas Costa put up for sale by Juventus'

Manchester United have reportedly been put on alert to the potential availability of Juventus winger Douglas Costa.

The 29-year-old has been touted as a possible alternative for Jadon Sancho, who remains United's top transfer target but whose £108m asking price is deemed too high by the club's hierarchy.

Goal reports that Juventus have now lost patience with Costa due to his recent injury problems and would be open to offers for him this summer.

New Juve boss Andrea Pirlo has already undergone a significant overhaul of his squad since taking over, with Gonzalo Higuain, Miralem Pjanic, Sami Khedira and Blaise Matuidi - all of whom are over the age of 30 - being shipped out.

Costa missed a large chunk of last season through injury and will miss the beginning of the new campaign too.

The winger, who has two years left on his contract at the Allianz Stadium, remains keen to stay in Turin and prove his worth to Pirlo.

In addition to United, clubs in the UAE Pro League are also thought to be considering a move for Costa, although his injury record is causing hesitation among potential suitors.

Costa has only made 40 Serie A appearances over the past two seasons, scoring four goals and creating eight more in that time.

Kylian Mbappe 'wants to leave PSG, interested in Manchester United, Liverpool'

Kylian Mbappe has reportedly informed Paris Saint-Germain that he wants to move to another club in the future.

Due to the financial implications of the coronavirus pandemic, none of European football's top clubs can currently afford a world-record bid for the France international

PSG sporting director Leonardo has acknowledged that he will look to take advantage of the situation by offering Mbappe a contract extension, tying the World Cup winner to the Ligue 1 champions past 2022.

However, according to The Times, the 21-year-old has his sights set on a transfer to a club in the Premier League or La Liga.

The report suggests that Mbappe is open to the idea of signing for Liverpool or Manchester United, while speculation regarding a potential switch to Real Madrid will not go away.

Despite the prospect of lower offers being made next summer, PSG are unlikely to agree to a sale over the coming weeks.

More transfer news from Manchester United:

Manchester United 'told to pay £50m for Bournemouth midfielder David Brooks'
Manchester United are reportedly told that it will take a bid of £50m to prise midfielder David Brooks away from Bournemouth this summer. Read more.

Manchester United 'will target Gareth Bale if Jadon Sancho bid fails'
Manchester United will reportedly move for Real Madrid forward Gareth Bale if they fail to make progress with their bid to sign Borussia Dortmund winger Jadon Sancho. Read more.

Jamie Carragher hits out at "disrespectful" clamour for Liverpool Thiago deal
Liverpool legend Jamie Carragher claims that the club are looking to offload up to four more players but believes that the clamour to sign Thiago is "disrespectful". Read more.

Sergio Reguilon 'prefers Sevilla return to Manchester United move'
Real Madrid defender Sergio Reguilon would reportedly prefer to return to Sevilla rather than make the switch to Manchester United. Read more.

Tottenham Hotspur to rival Manchester United, Sevilla for Sergio Reguilon?
Tottenham Hotspur are reportedly ready to rival Manchester United and Sevilla in the race to sign Real Madrid defender Sergio Reguilon. Read more.

Uli Hoeness accuses Liverpool, Man United of "blackmail" over Thiago deal
Former Bayern Munich chief Uli Hoeness accuses Liverpool and Manchester United of trying to "blackmail" the club over a deal for Thiago Alcantara. Read more.

Diogo Dalot 'unhappy at Manchester United'
Manchester United manager Ole Gunnar Solskjaer reportedly will not allow Diogo Dalot to leave despite the defender's lack of game time at Old Trafford. Read more.