The Spain international played alongside the five-time Ballon d'Or winner for seven years at Camp Nou, and this evening the two could go head to head in the first leg of their last-16 Champions League tie at Stamford Bridge.
"He's the best player in the world, but he's not invincible," The Telegraph quotes Pedro as saying. "It's probably a hard game for us, a massive game, but if the team are really focused on fighting together, you never know in football.
"We'll have possibilities to get through but obviously, it's Barcelona. It's Leo Messi. It's very difficult to stop this guy because he's very quick, very clever out on the pitch. But, look, it's not impossible."
Pedro has scored once and created two assists in five outings in the Champions League this season.