In June 2014 Ewels was a member of the England under-20 team that won the 2014 IRB Junior World Championship. He partnered Maro Itoje in the second row as they beat South Africa in the final at Eden Park. The following year Ewels captained the side as they won the 2015 Six Nations Under 20s Championship and was also chosen to lead the side that finished runners up to New Zealand at the 2015 World Rugby Under 20 Championship.