In a comical twist during Millwall's clash with Middlesbrough, fans witnessed Duncan Watmore momentarily forgetting that he was no longer a Boro player.
It was the opening matchday for the EFL Championship, which saw Middlesbrough host Milwall. The clash ended in a 1-0 victory for the visitors.
In the second half, Millwall's manager, Neil Harris, made a tactical substitution, bringing off Watmore for fresh legs.
Little did anyone anticipate the laughable turn of events which saw Watmore making his way to the touchline and start to head back towards the Middlesbrough bench, leaving his Millwall teammates and the home crowd bewildered.
Duncan Watmore played at Middlesbrough for three years, between 2020-2023, though joined Milwall in January 2023.
Having spent three years on Teesside, making 97 appearances for Boro, Duncan Watmore had become accustomed to sitting in the home dugout when he wasn't on the pitch
Fans took to social media to share their views on the amusing mid-match moment
Some even suggested that his bench blunder showed he was 'faithful' to Boro
Players and fans enjoyed the light-hearted moment amidst the action on the pitch
It was a moment of pure habit from the talented winger, who spent several successful seasons at Middlesbrough before making the move to the Den earlier this summer.
Caught on camera, Watmore's hilarious blunder quickly became a viral sensation, with fans online joining in on the laughter.
It was an easy mistake for the winger to make, considering it was his first return to the Riverside Stadium since departing the club.
Having spent three years on Teesside, making 97 appearances for Boro, Watmore had become accustomed to sitting in the home dugout when he wasn't on the pitch.
Watmore's new teammates and Millwall staff took the chance to remind him that he was now part of the Lions' pride, with the endearing mix-up providing a brief respite from the high-stakes Championship action unfolding on the pitch.
Social media soon caught wind of the incident, and memes and humorous tweets started circulating, poking fun at Watmore's short-lived confusion.
Despite the hiccup, Watmore has already begun to prove his worth to Millwall, showcasing his blistering pace and attacking prowess.
Millwall will be looking to improve their eighth-place finish in the 2022-23 campaign, while Middlesbrough will hope to nab a top spot after a fourth-place finish last season.