"We are doing everything, but it also depends on other parties," Ten Hag is quoted as saying by Sky Sports about his desire to sign the 28-year-old Blind.
The 'other parties', not only referred to United but also Boca Juniors, where the 24-year-old Magallan has been since 2012 and for whom he helped retain Argentina's top-flight title last season.
"He is still in the picture, but whether he actually arrives is still unclear," Ten Hag added about Magallan. "It will be either one of Magallan or Blind.
"Both of them do not seem realistic."
(Reporting by Aditi Prakash in Bengaluru)
