The decision to award Newcastle United's winning goal against Arsenal was correct, according to the Premier League's Key Match Incidents panel.
However, the panel ruled Arsenal's Kai Havertz should have been sent off for his tackle on Sean Longstaff, while Bruno Guimaraes should also have been shown a red card for hitting Jorginho.
The panel, which also includes one representative each from the Premier League and PGMOL, reviews major incidents to assess whether the eventual rulings, including video assistant referee checks, were correct.
At St James' Park on Saturday, the awarding of Gordon's controversial second-half winner for Newcastle was described as "embarrassing" and a "disgrace" by Arsenal manager Mikel Arteta.