Ten Hag was confirmed as United's new boss last month, with the Ajax winner poised to take charge of the team from next season.
He recently held talks with the Red Devils hierarchy ahead of his move to the Premier League, with several matters discussed.
And Wan-Bissaka, Rashford and Bailly have all endured troublesome campaigns prior to the Dutchman's arrival.
Wan-Bissaka has fallen behind Diogo Dalot in the pecking order this term under Ralf Rangnick, having previously been a regular under Ole Gunnar Solskjaer.
And Rashford has fallen out of favour, too, with Anthony Elanga often picked over the England international at present.
And United are certainly in the mix to secure his signature, with the club primed to lose at least two central midfielders.
And Paul Pogba is unlikely to sign a new deal amid interest from Juventus, Paris Saint-Germain, Real Madrid and Manchester City.
Ronaldo has scored 24 goals across all competitions, more than any other player on the books at Old Trafford.