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 City offer Ilkay Gundogan in part-exchange for Saul Niguez?

Manchester City are allegedly prepared to lodge an approach for Atletico Madrid midfielder Saul Niguez.

Despite possessing a long-term contract and a £130m release clause, Saul is reportedly available for the right price during the summer transfer window.

However, while there has been previous interest from Manchester United, it appears that neighbours City are ready to make a bid for the versatile 25-year-old.

According to reports in Spain, City are willing to include Ilkay Gundogan in any proposal for the long-serving Atletico man.

Gundogan still holds a three-year deal at the Etihad Stadium, with the latest extension being penned just 12 months ago.

Nevertheless, it is claimed that Pep Guardiola is open to parting ways with a player who has contributed 22 goals from 164 appearances since his arrival from Borussia Dortmund in 2016.

Four Premier League clubs chasing Manchester United defender Chris Smalling?

Manchester United defender Chris Smalling is reportedly attracting interest from four clubs in the Premier League.

While the centre-back has recently returned from a season-long loan spell at Roma, the England international would like to return to Stadio Olimpico on a permanent basis.

However, the Serie A outfit are yet to meet the player's £20m asking price, leaving open the possibility of a transfer to another English side.

According to 90 min, a quartet of sides are monitoring the situation, including Smalling's former club Fulham who have just earned a return to the top flight.

The report claims that Newcastle United, Everton and West Ham United are also happy to meet the player's valuation before the beginning of the new campaign.

That said, Smalling has allegedly informed United that he will make the final decision regarding his future.

More transfer news from Manchester United:

Barcelona 'eye Paulo Dybala as Lionel Messi replacement'
Barcelona identify Juventus attacker Paulo Dybala as a potential replacement for Lionel Messi, according to a report. Read more.

Agent: 'Paul Pogba contract talks with Manchester United will start soon'
The midfielder's contract expires next summer. Read more.

Manchester United handed boost in pursuit of Bournemouth winger David Brooks?
Manchester United are handed a boost in their efforts to sign David Brooks after Bournemouth boss Jason Tindall suggested that the winger can leave for the right price. Read more.

Napoli president: 'No suitable bids for Kalidou Koulibaly'
Napoli president Aurelio De Laurentiis insists that the Italian giants have still not received a suitable offer for Kalidou Koulibaly. Read more.