Rasmus Hojlund netted twice for Napoli, inspiring a victory over Sporting Clube de Portugal in the Champions League and sending a stinging message to Manchester United fans.
The striker gestured towards the Champions League badge on his sleeve as he celebrated his first goal at Napoli's Stadio Diego Armando Maradona.
The Danish international was set up by former Manchester City wizard Kevin De Bruyne before coolly slotting home to give his new side a 1-0 lead, threading the ball through Rui Silva's legs.
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Sporting clawed their way back into the match when Luis Suarez converted a penalty in the second half, but Hojlund wasn't done yet. De Bruyne once again played the role of provider, whipping a tantalising ball into the box for on-loan United forward Hojlund to head home, sparking more ecstatic celebrations.
The Dane celebrated with his former cross-city rival, having begun to kick-start his career under Antonio Conte. Prior to his performance against Sporting, Hojlund had found the back of the net once.
The former Atalanta frontman joined Napoli on loan last summer in a deal that includes a £5million loan fee and a reported obligation to make the move permanent for £38m, should the Italian heavyweights secure Champions League qualification next season.
Hojlund wasn't the only loanee to shine in the Champions League as United face a season without European football. Marcus Rashford provided another assist for Barcelona in their loss to Paris Saint-Germain.
Following his transfer to Napoli, Hojlund stated: "I come with a lot of international experience, I played in the Premier League, Champions League, Europa League, and in multiple countries.
"I come with a lot to prove. I want to show myself in the best team in Italy, and Napoli is going to be very, very good.
"I always work hard, I like to say I want to die on the pitch, to give everything for the team, to score goals, create, and fight for everything," he added.
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