Heat gas or charcoal grill. In small bowl, mix cheese, mayonnaise, Worcestershire sauce and garlic until blended; set aside.
Place steak on grill. Cover grill; cook over medium-high heat 15 to 20 minutes, turning once, until desired doneness. Remove steak from grill.
Spoon cheese mixture over steak; let stand 1 to 2 minutes or until cheese is slightly melted. Cut steak into pieces to serve.