Matthew Leo was born on 8 May 1992 in Adelaide, South Australia,[2][3] and raised in the suburb of Semaphore.
He played Australian rules football for St Michael's College, Adelaide, in year 10.
[15] On 27 April 2020, Leo was allocated to the Philadelphia Eagles as part of the International Player Pathway Program.
[16][17][18][19][20] He was waived during final roster cuts on 4 September 2020,[21] and signed to the practice squad under an international player exemption two days later.
[24] Leo was selected by the Edmonton Elks in the fourth round (35th overall) of the 2021 CFL Global Draft in April 2021.