Carel Frederick Kirstein Greeff (born 20 May 1990) is a South African rugby union player, currently playing with Italian Top12 side Rugby Rovigo Delta. His regular position is loose-forward.
He represented the Leopards at the 2006 Under-16 Grant Khomo Week, 2007 Under-18 Academy Week and 2008 Under-18 Craven Week competitions. His performances in the latter also resulted in his inclusion in an Under-18 South African Elite squad in 2008.
The then joined the Sharks and was included in their U19 squad for the 2009 Under-19 Provincial Championship competition.
MTN Golden Lions
In 2011, he made his first class debut for the Golden Lions in a compulsory friendly match prior to the 2011 Currie Cup Premier Division season, starting the match against the Falcons. He never appeared in the competition proper, instead representing the Golden Lions U21 team in the 2011 Under-21 Provincial Championship competition, making twelve appearances.
Varsity Cup Rugby
He played in the 2013 Varsity Cup competition for Wits, scoring five tries in seven appearances, making him the joint second top try scorer in the competition.
He then joined Griquas before the 2013 Currie Cup Premier Division. He made his debut for them in the opening match of the season, coming on as a half-time in their match against the Sharks in Durban. He scored a try in injury time to tie the score 30–30 and a Nico Scheepers conversion gave Griquas a dramatic victory.
Toyota Free State Cheetahs
In 2014, Greeff was included in the Cheetahs squad for the 2014 Super Rugby season. He was named on the bench for their matches against the Western Force and the Brumbies, but didn't get playing time.
However, on 24 May 2014, he made his Super Rugby debut against the Stormers in Cape Town, coming on as a reserve flank.
Greeff signed a two-year contract with Port Elizabeth-based Super Rugby side the Eastern Province Kings prior to the 2016 season. However, after the side failed to pay players' salaries, allowing all players to join other teams, Greeff moved to Nelspruit to join the Pumas on a two-year deal instead.
Toscana Aeroporti I Medicei
Greeff moved to Italy to join National Championship of Excellence side I Medicei in 2017.
He played a total of 52 games and scored 75 points for I Medicei in 3 full seasons.
Rugby Rovigo Delta
In 2020, Greeff signed a two-year contract with the Top12 side to officially join Rugby Rovigo Delta.