Mosta secured the services of Mexican midfielder Misael Miranda Gomez from St. Andrews.
The 22-year old midfielder had joined St. Andrews last season from Phoenix Sports Academy of Jamaica.
The Blues, now led by coach Enrico Piccioni, had earlier signed James Brincat, Kurt Zammit, Brazilian defender/midfielder Romeu Péricles Romão, Nigerian defender Emmanuel Ibok Edet, Japanese midfielder Kei Hirose and Brazilian strikers Johnny Dias and Renan Abner Do Carmo De Oliveira and young Italian striker Matteo Gallo.