Masekesa, 27, has played 15 first-class matches and taken 49 wickets, while Welch, nearly 27, has played 26 first-class games and scored 1216 runs at an average of 31.
Zimbabwe made two changes to their ODI squad, replacing Myers and Joylord Gumbie with Wessly Madhevere and Nyasha Mayavo. Myers, however, kept his place in the T20I squad while Faraz Akram and Takudzwanashe Kaitano missed out on selection.
Ireland’s tour of Zimbabwe begins with the one-off Test in Bulawayo followed by the white-ball leg in Harare: three ODIs on February 14, 16 and 18 and three T20Is on February 22, 23 and 25.
Zimbabwe Test squad vs Ireland
Craig Ervine (capt), Brian Bennett, Johnathan Campbell, Ben Curran, Joylord Gumbie, Trevor Gwandu, Takudzwanashe Kaitano, Vincent Masekesa, Nyasha Mayavo, Blessing Muzarabani, Richard Ngarava, Newman Nyamhuri, Victor Nyauchi, Nicholas Welch, Sean Williams.
Zimbabwe ODI squad vs Ireland
Craig Ervine (capt), Brian Bennett, Johnathan Campbell, Ben Curran, Trevor Gwandu, Wessly Madhevere, Tinotenda Maposa, Tadiwanashe Marumani, Wellington Masakadza, Nyasha Mayavo, Blessing Muzarabani, Richard Ngarava, Newman Nyamhuri, Sikandar Raza, Sean Williams.
Zimbabwe T20I squad vs Ireland
Sikandar Raza (capt), Brian Bennett, Ryan Burl, Johnathan Campbell, Trevor Gwandu, Wessly Madhevere, Tinotenda Maposa, Tadiwanashe Marumani, Wellington Masakadza, Nyasha Mayavo, Tony Munyonga, Tashinga Musekiwa, Blessing Muzarabani, Dion Myers, Richard Ngarava, Newman Nyamhuri.
