Now, Fernandes has reached out to his Portugal team-mate Neto on social media. In a four-word comment, the United captain wrote: "Chuta que chutas bem."
Translated from Portuguese, this means: "Kick you kick good."
His playful response to Neto's post included a heart eyes emoji.
Neto was instrumental in Chelsea's 3-0 triumph over Forest on Saturday, scoring a free-kick and setting up Josh Acheampong for the first goal.
Reece James sealed the victory in the final moments, earning Chelsea three points and leading to the dismissal of Postecoglou shortly after the final whistle at the City Ground.
TNT Sports pundit Peter Crouch commented on the Neto and Garnacho incident, stating: "Chelsea were a bit sloppy. Credit to Enzo [Maresca] for making those changes.
"I know Neto was really frustrated with him. He was crossing the ball and not getting on the other side. Neto was really frustrated with him."
Following the match, Garnacho took to social media. On Instagram, he posted: "Happy for these three important points!" along with blue and white heart emojis on his stories.