Following Lee Grant’s retirement, United have three senior keepers, namely David de Gea, Tom Heaton and Dean Henderson.
However, Henderson is set to spend next season on loan at Nottingham Forest, with the 25-year-old looking for first-team football ahead of the World Cup in November.
As such, Erik ten Hag will require another shot stopper to serve as second or third choice behind De Gea, and Bachmann has been identified as a potential signing.
The transfer should not cost a great amount however, given the Hornets’ recent relegation from the Premier League.
Last season was not a good one for Watford, as the club laboured to 19th in the table, conceding 77 goals in the process, with only Norwich and Leeds having a leakier defence, and going through three different managers in the form of Xisco Munoz, Claudio Ranieri and Roy Hodgson.
Bachmann, 27, shared goalkeeping duties with former United player Ben Foster, but was unable to prevent Watford’s demise, shipping 32 goals in 13 games and failing to keep a single clean sheet.
United are linked with a number of different players this summer as Ten Hag begins his rebuild of the Red Devils with a £40million deal for Ajax winger Antony said to be very close.
Ten Hag is also still pushing for Barcelona’s Frenkie de Jong, but the defensive midfielder is proving hard to get, with the La Liga side wanting upwards of £70m for the Dutchman, who himself is keen on staying at the Nou Camp.
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