Man City can end transfer uncertainty with £51m deal for Europe's 'most hidden secret'

It is set to be a busy summer in the transfer market for Manchester City as Pep Guardiola sets about restoring his side as Premier League and Champions League challengers.

The first phase of their rebuild involved a busy January transfer window which saw the arrivals of Omar Marmoush, Nico Gonzalez, Abdukodir Khusanov and Vitor Reis and the summer is expected to continue in a similar vein.

Hugo Viana will succeed Txiki Begiristain as the club's new sporting director and one of his immediate transfer priorities will be the club's goalkeeping situation.

Ederson has been the club's number one goalkeeper for the past eight seasons and has transformed the way the position is played.

The Brazilian international has been crucial to City's success in that time but mistakes have started to creep into his game this season and he was close to leaving City in the summer.

Interest from the Saudi Pro League has not cooled on the 31-year-old and he is out of contract next summer. So, too, is second choice goalkeeper Stefan Ortega.

Ortega has been included in some Germany squads this season and has proven his worth when stepping up in Ederson's absence, none more so than his crucial save in City's win over Tottenham in the penultimate game of last season's Premier League title win.

A number of Bundesliga clubs are keen to make the 32-year-old their number one goalkeeper next term and that could leave City in an awkward spot.

It would be a wrench to let either goalkeeper leave, particularly, Ederson, but this summer may be the time to act while they can still command a fee for both of them.

As such, City are already running the rule over potential replacements and the Manchester Evening News revealed earlier in the week that Porto