Twitter user The Red Devils (h/t Calciomercato.com) shared the image of a Chilean flag followed by an arrow pointing to a devil emoji:
According to Sky Sports News, United are prepared to spend £35 million to prise Sanchez from Arsenal and offer him over £350,000 per week, which appears to have fended off Manchester City, who were unwilling to match those terms.
Sky Sports' Kaveh Solhekol noted the impact Sanchez's yearly salary of over £18 million would have on their wage bill:
However, Red Devils legend and Sky Sports pundit Gary Neville believes it still represents good business for the Manchester outfit:
What's more, Zlatan Ibrahimovic's time at the club will almost certainly come to an end in the summer if not before, with the Swede now aged 36.
United boss Jose Mourinho gave an update on the club's pursuit of Sanchez after they beat Stoke City 3-0 on Monday night, per Goal UK:
Although Sanchez's form has left much to be desired this year, he could prove a sensational capture for the Red Devils.
The move away from Arsenal could reinvigorate him and allow him to return to the heights he displayed last season, when he scored and assisted a combined total of 49 goals.
That's the kind of firepower United need to give more of a challenge to City, and he would also provide a healthy boost to their UEFA Champions League campaign, too.
Lukaku's post has added fuel to the speculation, but United fans will be hoping for more concrete developments in the coming days.