The England international managed to nab the famous shirt following the Gunners' 4-3 aggregate defeat to Barca in the Champions League back in 2011 courtesy of former Arsenal teammate Cesc Fabregas.
"I asked Xavi for his but he had the hump a bit," Wilshere told Match of the Day magazine. "So he just threw me his shirt and strolled off. I asked Cesc Fabregas to get me Messi's because they're good friends, and he did."
Meanwhile, Wilshere is preparing to go up against Liverpool with his teammates at the Emirates tomorrow.