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.

Tuesday morning's Manchester United transfer talk news roundup:

Borussia Dortmund 'concerned by Champions League add-on in Man Utd Sancho bid'

Borussia Dortmund reportedly have concerns regarding the structure of Manchester United's proposal for Jadon Sancho.

Although Dortmund have frequently stressed that they have no intention of parting ways with the England international, United remain eager to negotiate a deal.

The Premier League giants are said to be willing to pay £90m for the attacker, providing that a portion of the fee is made up in add-ons.

According to ESPN, United officials want to insert a selection of bonuses which relate to the club's performances in the Champions League.

Dortmund are allegedly worried that United will not qualify for European football's premier competition every year, leaving them at risk of missing out on a considerable amount of money.

The Bundesliga outfit may remain against selling Sancho unless they receive a bid of £108m.

Manchester United 'planning late £90m bid for Jadon Sancho'

Manchester United are reportedly preparing a late £90m bid for Borussia Dortmund winger Jadon Sancho.

The Red Devils' pursuit of the 20-year-old has been a constant presence throughout the summer transfer window, but there has still been no progress in talks between the clubs heading into the final week of the window.

Dortmund are adamant that they will not lower their £109m asking price for Sancho and have publicly insisted that he will not leave the club on a number of occasions in recent weeks.

United still regard Sancho as their top target but are unwilling to stump up £109m in a post-coronavirus market.

The Daily Mail reports that Ed Woodward will instead return with an offer worth an initial £65m which will then include achievable add-ons to take the overall value of the transfer to £90m.

United are hopeful that the late bid will test Dortmund's resolve late in the window, although the Bundesliga outfit are not thought to be under any pressure to cash in on one of their star assets.

Donny van de Beek remains the only signing Ole Gunnar Solskjaer's side have made this summer, although they have been heavily linked with Alex Telles and are also thought to be considering a number of Sancho alternatives.

More transfer news from Manchester United:

Manchester United 'open to Daniel James exit if Jadon Sancho arrives'
Leeds United will reportedly be given the chance to sign Daniel James from Manchester United should their rivals first land Borussia Dortmund's Jadon Sancho. Read more.

Inter Milan 'willing to offer Chelsea Skriniar, Brozovic in N'Golo Kante deal'
Inter Milan are reportedly willing to offer Chelsea both Milan Skriniar and Marcelo Brozovic as part of any deal to take N'Golo Kante in the opposite direction. Read more.

Daniel James 'wants Manchester United stay amid Leeds United interest'
Daniel James reportedly wants to remain at Manchester United this season, despite attracting interest from Leeds United. Read more.

Napoli chief rules out Kalidou Koulibaly exit
Napoli sporting director Cristiano Giuntoli suggests that in-demand defender Kalidou Koulibaly will spend the current season at the Serie A side. Read more.