The Office Of Apostle Doesn't Require Ordination

St. Robert Bellarmine, De Romano Pontifice, Book 1, Chap. 23: “I respond that in the office of Apostle is contained the office of Bishop, and that Bishops are the successors of the Apostles, not because by the very fact that someone is an Apostle he is a Bishop (for in Luke 6 the Lord chose twelve disciples and called them Apostles even before He made them Priests, much less Bishops; for to the office of Apostle properly pertains the right of preaching, to which has been tied a certain delegated jurisdiction of a very broad nature, such as can exist even in non-Bishops), but because all the Apostles were Bishops [i.e. overseers], nay the very first Bishops of the Church, even though they were not ordained.”