Chelsea supporters have launched a conspiracy theory over a potential swap deal as they attempted to explain the lack of game time afforded to forward Marc Guiu.
Guiu had left Chelsea in the summer transfer window with the 19-year-old joining Sunderland on a season-long loan on August 6.
The Spanish forward made three appearances for the Black Cats and scored once, netting in a Carabao Cup tie against Huddersfield.
Chelsea exercised an option to recall Guiu on August 31, with the forward returning 25 days after leaving the Blues.