"They do, actually. We'll see what happens. We'll see if the fans respond to Brock and how it goes."
Asked to explain further, Grillo would only add: "I can’t say any of that because they will fire me... Marvel's very strict about what you’re allowed to say."
Grillo did say the movie sequel is "an origin film" in which we'll: "meet people who are going to be around for a while, so they introduce the characters."
Anthony Mackie is poised to play Harlem crime fighter Falcon. Cobie Smulders will reprise her role of Maria Hill. She joins her boss in The Avengers co-star Samuel L. Jackson and Scarlett Johansson. for the film. Frank Grillo ("The Grey," "Warrior") will play the villain Crossbones in the sequel. Toby Jones, has confirmed to Hey U Guys that he will reprise the role of the villain Armin Zola. Maximiliano Hernández said via Twitter that he will reprise his "Avengers" role of Agent Jasper Sitwell in the sequel. Robert Redford (Butch Cassidy and the Sundance Kid) has entered talks for a senior leadership role in S.H.I.E.L.D. UFC Welterweight Champion Georges St-Pierre will play villain Batroc the Leaper, an infamous mercenary in the Cap mythology.
Joe Russo and Anthony Russo are directing the sequel, using a script by Christopher Markus and Stephen McFeely.
The sequel will hit theaters April 4, 2014.
Grillo was also asked about the possibility of his character showing up on "Marvel's Agents of S.H.I.E.L.D." TV series: "At this point in my career, it's something that I'm not really interested in doing," he said about an appearance on the television series. "Not that I don't want to do it, but it doesn't get me going anymore to do something like that."