The 22-year-old spent time with Atromitos and OFI Crete, before he left his native Greece to join Lazio last summer.
Mandas has made just 10 competitive appearances this season, keeping five clean sheets and conceding just seven goals.
Although he has spent the majority of the campaign on the bench, Mandas is currently enjoying a run of games in the absence of Lazio's first-choice goalkeeper Ivan Provedel.
The former Greece Under-21 international has started the last six league games, keeping clean sheets in Lazio's previous two outings against Genoa and Hellas Verona.
Despite being in his first season at Lazio, Mandas is already being linked with a move away from Stadio Olimpico.
According to Corriere dello Sport, Man United and Man City are both showing an interest in Mandas ahead of the summer transfer window.
The report suggests that Man City are pushing hardest to sign Mandas, having already made contact over a potential move.
Mandas is currently under contract until the summer of 2028, but Lazio are keen to discuss are new deal in a bid to ward off his potential suitors.
The Italian club are willing to offer the shot-stopper an improved salary and a one-year extension to keep him at the club until 2029.
Why are Man United, Man City targeting Mandas?Man United are believed to be keeping tabs on Mandas due to the uncertainty surrounding Altay Bayindir's future at Old Trafford.
The Turkey international could seek game time elsewhere after making just one competitive appearance since arriving from Fenerbahce last summer.
The Red Devils have also been linked with a move for Mandas' teammate Provedel as they look
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