But it ended on a positive note as the tighthead-prop was a late call-up for the Wales squad for their summer tour and he made his international debut against Tonga.
The 21-year-old also started Wales’ next game against Samoa and will now be targeting a strong start to the new season with club side Cardiff Blues in the Guinness PRO12.
Lewis began his rugby journey as a junior at Pontypridd RFC, later being picked up by the Cardiff Blues academy and earning Wales age-group honours.
The tighthead-prop was part of the Wales under-20s side for the 2015 Rugby World Championships in Italy having made his Blues debut in the Anglo-Welsh Cup that February.
He made his Guinness PRO12 debut in a 35-27 defeat to Munster in October 2015 off the bench and went on to make three starts and nine further substitute appearances in all competitions in 2015-16.
Building on Wales debut
After injury restricted him to just one start last year, Lewis is looking to build on his successful summer and use the experience of international rugby to good effect in a Cardiff Blues shirt.
“It was a massive experience for me, I gained loads of knowledge from the older boys that went and the coaches,” he explained.
“The exposure I got was excellent for me. Obviously being 21 and still learning my trade it was a brilliant experience.
“Last year was tough with how long the injury put me out for but I’m getting some momentum from the summer and hopefully I can take that into this pre-season.
“If you told me that in December, I wouldn’t have believed you. It’s a bit surreal and hasn’t sunk in yet to think I got my first cap (against Tonga), and then against Samoa with the start.
“It’s a once-in-a-lifetime experience really to play Samoa in Samoa and Tonga in New Zealand – it’s definitely something I will remember and cherish.”
Exciting future ahead
Lewis signed a new contract with the Welsh region earlier this year with head coach Danny Wilson admitting he had high hopes for the young front row.
“Dillon is a very good scrummaging prop, with a good all-round game, and has achieved a lot of success at age-grade level,” he said at the time.
“He has been unfortunate with injuries this season but has a big future in front of him if he continues to work hard and progress.”