Rookie centres Ollie Lawrence and Cameron Redpath will start for England and Scotland respectively in Saturday's Calcutta Cup clash at Twickenham.
Lawrence and Redpath go head to head, having played in the same midfield for England Under-20s in 2019.
But Redpath isn't the only former England U20 star who will be playing for a different country in the 2021 Six Nations.
1. Ross Moriarty (Wales)
The hulking back-rower, whose father is former Wales international Paul Moriarty, initially played for England at both U18 and U20 level, winning the IRB Junior World Championship in 2014. However, he has since made his full international debut for Wales and has since won 44 caps while also representing the British & Irish Lions during their tour of New Zealand in 2017.
2. David Sisi (Italy)
With the England under 20 team, Sisi won both the Six Nations twice and a first Junior World Cup for England at the time. However, after moving to Zebre 2017, he declared for Italy and has so far won 9 caps.]
3. Johnny Williams (Wales)
The 23-year-old made an appearance with the red rose on his chest only last year, starting inside-centre for an England XV against the Barbarians. And with a father from north Wales, Williams also qualifies to pull on the red jersey – with that sole appearance at Twickenham not committing him to England as it was an uncapped match.
4. Sam Skinner (Scotland)
Despite playing for England U20, Qualifying through this father, in October 2018 Skinner was called up to the senior Scotland squad for the Autumn Internationals. On 10 November 2018 he was given his Scotland international debut, starting at
lock against
Fiji at Murrayfield Stadium. Skinner received the Man of the Match award; making 7 tackles and 44 metres in the game.
5. Nick Tompkins (Wales)
Tompkins played for England at age group level and England Saxons. In January 2020 Tompkins was selected for the senior Wales 2020 Six Nations squad. He qualifies for Wales through his Wrexham-born grandmother
. On 1 February 2020 Tompkins made his international debut for Wales as a first half injury replacement in the 42-0 win against Italy and scoring a try.