5. Mako Vunipola (England to Tonga)
- Current number of caps: 70
- Age at the start of RWC 2023: 32
- Did you know:? In 2018, Vunipola and his partner welcomed a son, Jacob.
Born in Wellington, New Zealand, the loosehead-prop would be eligible to play for Tonga as he is the son of former Tonga captain Fe’ao Vunipola.