On 25 October 2013, he joined League One side Coventry City on a 28-day youth loan; "Sky Blues" manager Steven Pressley said that "Jamar is very quick but he's also very direct and very strong and he's the kind of player that would fit well into our system".
[3] He made his debut in the Football League on 2 November, in a 3–0 win over Notts County at Sixfields Stadium, coming on as an 81st-minute substitute for Callum Wilson.
[6] He made his debut for the "O's" the following day, and provided an assist for Moses Odubajo to score Orient's first goal in a 2–0 victory win over Shrewsbury Town at the New Meadow.
He came off the bench for Norwich in the Championship on 17 March against Huddersfield Town at the Galpharm Stadium, and scored his first goal for the club eight minutes into injury time to secure a 2–2 draw.
[17] He returned to Norwich after two games for the "Boro", and scored five goals for the under-21s against Southampton under-21s, but manager Alex Neil admitted that the club's promotion to the Premier League reduced the chances for young players to earn first team opportunities.
[28] On 19 December 2020, Loza made his return to a Woking shirt, during their 2–1 home victory over Dover Athletic in their FA Trophy third round tie, replacing Dave Tarpey in the 56th minute.
[30] Just a week later, Loza scored the all important goal to propel the Cards into the semi-finals of the FA Trophy, latching onto team-mate, Charlie Cooper's header before driving a well-worked solo effort past Torquay United goalkeeper, Marcin Brzozowski in the 37th minute.
[37] Loza made his debut for Jamaica in a 2–2 draw with Egypt in a friendly at Brisbane Road on 4 June 2014; he entered the game as a substitute, replacing Simon Dawkins in the 84th minute.
[40] He was called up to the under-23 side, and scored on his debut, a 6–1 win over Saint Lucia at the Estadio Olímpico Félix Sánchez on 24 June 2015 in a qualification game for the 2015 CONCACAF Men's Olympic Qualifying Championship.
Speaking in June 2014, Norwich City manager Neil Adams described Loza as "a direct player who is lightning quick and can run with the ball, and he causes defenders a lot of problems".