The Premier League giants were linked with the England international throughout last summer's transfer window before eventually refusing to meet Dortmund's £110m asking price.
While Sancho has failed to replicate the form of the previous campaign, the 21-year-old now has just over two years remaining on his contract.
According to Manchester Evening News, United are giving thought to the possibility of reigniting their interest in the attacker later in 2021.
Amad Diallo was regarded as an alternative when he signed from Atalanta BC in January, but it is suggested that Sancho still remains on United's radar.
Dortmund chief executive Hans-Joachim Watzke has previously acknowledged that he may be prepared to consider any 'exceptional offers'. body check tags ::