Saturday night, rising welterweight star Rory MacDonald will face his toughest test inside the Octagon when he takes on former two-divison champion BJ Penn.

MacDonald, a protege of UFC welterweight champion Georges St. Pierre, has fought to a record of 4-1 in the UFC. The Canadian’s only loss came at the hands of former title challenger Carlos Condit, who came back to finish MacDonald in the final seconds of the fight. MacDonald is now riding a three-fight win streak, with wins over Nate Diaz, Mike Pyle and most recently Che Mills.

Following his win over Mills earlier this year, MacDonald took it upon himself to call out Penn, who was retired at the time. The 23-year-old issued the challenge in order to build his resume and to take on such a respected opponent. Penn didn’t the comments lightly, claiming MacDonald is making a big mistake challenging him.

The two are scheduled face off on the main card of UFC on FOX 5, and on a recent conference call, MacDonald discussed his preparation for his bout with Penn. Hear his comments below.