The Catalan star was forced into donning the shirt by international team-mates Gerard Pique and Carles Puyol, who grabbed the midfielder and managed to pull the jersey over his head in front of a huge crowd of fans.
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Nevertheless, Fabregas appeared reluctant to keep the shirt on for long, seemingly aware of how the gesture might be interpreted at the Emirates.
The gesture comes after Fabregas yesterday declared that he was proud of being an Arsenal player.
The midfielder has been the centre of a long-running pursuit by the Catalan giants who seem intent on bringing him 'home' and are already believed to have had at least one offer for him rejected by the Gunners.
"All I can say is that this World Cup victory is for all the Arsenal players and fans, they are a world-class club," he said after Spain's 1-0 victory over the Netherlands in Johannesburg.
"I am an Arsenal player and proud to be."
Arsenal manager Arsene Wenger has also reportedly refused to meet Barcelona officials in South Africa to discuss a possible move for the player.
Spain had been received as national heroes by a crowd of over a million fans in Madrid and also met King Juan Carlos and prime minister Jose Luis Rodriguez Zapatero.
The celebrations continued as the team bus crawled along the Gran Via, with the crowd chanting: "Thanks to Iniesta, Spain is in fiesta!"
Click here to view the video of Spain's World Cup celebrations.