Erik ten Hag is said to be looking for reinforcements in the shot-stopping department, with current first-choice keeper David De Gea out of contract at the end of the month.
Despite winning the Premier League's Golden Glove award after keeping 17 clean sheets, the Spaniard made some noticeable and costly mistakes in between the sticks over the course of the campaign, and his 12-year stay at Old Trafford could be coming to an end.
Cameroon international Onana helped Inter Milan reach their first Champions League final in over a decade this season, however the 27-year-old conceded the only goal of the showpiece final to Rodri, meaning Manchester City completed a historic treble at the Italian side's expense.
The former Barcelona youngster played 24 times for Simone Inzaghi's men in Serie A this term, keeping eight clean sheets as the San Siro club finished third, securing Champions League football for next term.
Onana could soon be playing in UEFA's elite club competition for a different side however, with a report from the Manchester Evening News stating that Manchester United will make a bid for the goalkeeper this week.
With four years left on the player's current deal at Inter, it is understood that the Red Devils would not be able to bring Onana to Old Trafford for cheap, although the club's admiration for the shot-stopper is likely to keep them interested.
Ten Hag worked with the Cameroonian at Ajax before they both left for pastures new last summer, winning four-straight Eredivisie titles together between 2019 and 2022.
De Godenzonen struggled without Ten Hag and Onana during the 2022-23 term, only managing to finish third in the Dutch top flight, consequently missing out on Champions League football.
Current United keeper De Gea is yet to agree to a new contract at Old Trafford which would see him earn reduced wages, making the possible signing of Onana even more relevant as the new season fast approaches.
The report also adds that the Red Devils have enquired about the availability of Taylor Booth, with the attacker plying his trade at Dutch outfit FC Utrecht since moving from Bayern Munich last summer.
The 22-year-old scored two goals and provided four assists in the Eredivisie last term, and it is understood that United could move to bring the American to Old Trafford as they continue to be unsuccessful in their attempt to sign Mason Mount from Chelsea.
Ten Hag made the England international a primary target this summer, although their recent £55m bid for the midfielder is understood to have been swiftly rejected by the Blues, with Mount now said to be ready to hold talks with new boss Mauricio Pochettino.
Man Utd will be hoping that both Mount and Onana are walking out at Old Trafford for the home side next season - the latter featured 41 times for Inter last season in all competitions, keeping 19 clean sheets in the process.