Lady Gaga's new single has been deemed "chart-ineligible" by the Official Charts Company.
Mother Monster only recently decided to make her R. Kelly collaboration Do What U Want an official single after previously releasing it to fans who pre-ordered her new album, ARTPOP.
After the tune climbed to the top of the iTunes charts on both sides of the Atlantic, fans had expected to see Gaga's latest offering in this week's countdown - but when the Official Chart Update was released, it had failed to make the Top 40.
The Official Charts Company explained: "Lady Gaga’s Do What U Want (featuring R Kelly) will become chart eligible once the related album pre-order promotion ends. Official Chart rules, as agreed in committee with the British music industry, allow one ‘instant grat’ promotion per album, i.e a single track download given away as an album pre-order incentive.
"Do What U Want is the second track to be delivered to fans who pre-order ARTPOP, the track will become eligible to chart once the current chosen promotional period ends and the full album is released on 11 November."
The news comes after they changed their rules in February this year, which stated that any instant grat tracks would be unable to chart.
Gaga's new album ARTPOP, which also features originally-planned single Venus, is due for release on November 11.