Jose Aldo will be returning to the Octagon for UFC this weekend, and it looks as though some old rivals are going to be watching.Aldo is set to return to the Octagon at this weekend’s UFC 237 event in Rio in a featherweight bout Alexander Volkanovski.Ahead of his return, UFC decided to promote the Brazilian's fight by posting a photo of him on Instagram looking ripped and ready to go.Aldo's rival Conor McGregor saw the photo and decided to leave an interesting accusation on the post, which he later deleted.According to Chisanga Malata, McGregor said on the photo: "Back on the sauce," implying that Aldo has been taking performance-enhancing drugs.

McGregor deleted the comment, but he didn't remove it fast enough to stop someone from screen grabbing it for everyone else to see.

The rivalry between McGregor and Aldo began when Notorious was still competing in the UFC featherweight division.

Their first fight went down at UFC 194 on December 12, 2015, where the Irishman famously defeated the Brazilian in just 13 seconds when McGregor connected a left hook with Aldo’s chin.

In the process, McGregor became the first fighter to defeat Aldo in over a decade, and it's a rivalry which Aldo would like to revisit before he retires.

However, UFC hasn't really come close to booking a rematch between McGregor and Aldo due to the popularity rise of the Irishman and due to his desire for bigger fights.

While Aldo will be competing at UFC 237 this weekend, McGregor's future inside the Octagon is uncertain.

Several fighters have lined up to face him now he's been cleared to fight for over a month following his UFC 229 brawl suspension.

Yet, it's currently unclear as to when McGregor will return to the Octagon for another MMA fight, as he's currently on hiatus in order to try and secure an ownership stake in UFC as part of his fight negotiations.

If he is able to come to an agreement with UFC, Donald Cerrone is expected to be first in line to face the Irishman.