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Christ was addressing His gathered apostles and disciples, the bishops and priests of the Catholic Church.

Disciple = "learner, pupil, student" (Gk. mathetes, from the verb manthanein, "to learn")
Jesus is not the only "teacher" to have "disciples" in the New Testament; there are also "disciples of John [the Baptist]" and "disciples of the Pharisees" (Mark 2:18; 6:29; Matt 9:14; Luke 5:33).
In the ancient world, students/disciples usually sought out a teacher (cf. Luke 9:57-62); but Jesus usually reverses the dynamic, "calling" people to become his disciples (Mark 1:16-20; 2:14-17; 3:13; etc.).
Jesus did not establish a "school" in a particular location, but was an itinerant (wandering) preacher/teacher; thus, his disciples literally had to "follow" him around (Mark 8:34; 10:21; Luke 9:57-62; John 1:43).
The word "disciples" is used 233 times in the Gospels for Jesus' followers, but one should not assume that it refers only to "the twelve"; the phrase "twelve disciples" occurs only three times (Matt 10:1; 11:1; 20:17), and "disciples" often refers to this core group; but other people are also called "disciples" of Jesus (Matt 8:19-22; Luke 6:13, 17, 20; 19:37; John 4:1; 6:66; 8:31; 9:28; Acts 6:1-7; etc.).
If Jesus charged his Disciples are you then NOT one? Are not ALL Christians at least Disciples?