The 19-year-old wing made a sensational try-scoring Test debut for Wales against Canada during last month's summer tour after just two games of senior rugby. It capped a stunning rise to prominence for the former Welsh Schools sprinter who had been playing with Cardiff's semi-professional side in the Welsh Premiership just two months earlier.
Speedster Czekaj was promoted to the Blues regional side for the final two games of the Celtic season though still did enough to earn a place in Mike Ruddock's tour party for North America. And after impressing the Wales coach during training, Czekaj was handed a starting place against Canada in Toronto.
"It was an unbelievable season but everything that happened was thanks to what I learned in the Welsh Premiership," said Czekaj. "It's a great stepping stone to regional rugby. It exposes young players to tougher standards of training and playing for the first time. For me it was a great experience as I learned so much.
"You play every week and you come up against plenty of older and more experienced players who can learn so much from. I remember my first game for Cardiff was against Bridgend and Tonga international Aisea Havili (now with the Scarlets) just stepped outside and went right around me.
"The first game last season was against Pontypridd and I just remember how huge Dale McIntosh was. He was awesome in the pack but these are the guys you learn from.
"It proves that if you put in the work at training and listen to what you're coaches tell you then you can make it. It's hard because guys have day jobs as well but the opportunities are there if you want them."
Czekaj's story is remarkable but was mirrored, albeit over a slightly longer spell, by young Neath outside-half Matthew Jones who won his first full cap for Wales in the same game. Both players emerged through the ranks with Wales U21s, winning the Grand Slam earlier this year, but had the regular exposure in the Premiership to thank for getting their chance.
Newport's Wales U21 assistant coach Dai Rees said: "They both proved that you can make the step up from the Premiership to the regional and then international level.
"Years ago, these young lads would have been sat on benches at the big clubs or farmed out to the lower leagues. Now they are getting the regular rugby they need to develop."
Wales and Ospreys back row James King, who came through the North Wales age grade system, nominated North Wales Regional Community Rugby Manager Marc Roberts, in the WRU's 'Diolch' initiative where squad players thanked those who played a part in their rise to the top.
Beating Merthyr has boosted Carmarthen Quins hopes of reaching a top eight spot in the Principality Premiership. Quins captain Haydn Pugh is delighted with his team's progress and is determined that everyone from the Under 6s through to the senior team, enjoys the ride.
When the Wales squad were asked to nominate individuals who played a big part in their early playing days, Wales and Dragons full back and wing Hallam Amos thought of his former Monmouth School rugby coach John Bevan.
Sam Cross and Luke Treharne have been named as co-captains of the Wales Sevens side as head coach Gareth Williams names his 12-man squad to play in the first leg of the HSBC World Series in Dubai next weekend.
Bedwas head coach Steve Law and players Nicky Griffiths and Alun Rees extol the virtues of the close knit club as they prepare to host third place RGC 1404 - who are one place head of them on the Principality Premiership points table - on Saturday.
Many of the Wales squad have said Diolch (thank you) to someone who played an important part in their early playing days by nominating them to be invited to the Wales v South Africa match. One person, Gowerton Comprehensive geography teacher Mr Dean Mason was nominated by two of his former pupils, Dan Biggar and Sam Davies.
The second WRU disability rugby pilot has been delivered, this time in Caerphilly schools, culminating in a festival at the Caerphilly Centre of Sporting Excellence, Ystrad Mynach tomorrow. Plans are in place to set up a Disability Rugby Club in Newbridge to provide long-term playing opportunities.
WRU TV: Hear from inside the Wales camp as Neil Jenkins discusses this weekend's clash with South Africa and how the squad are looking to put in a strong performance to round of the 2016 Under Armour Series