The 22-year-old will take part in the decathlon at the Super League meeting in Lutsk, Ukraine this weekend [July 6-7].
Coached by David Hull, the former Hayesbrook School pupil is making his senior debut as one of only two newcomers in the squad.
There are four male competitors for the ten events, and Lewis finished third behind national indoor and outdoor champion John Lane and Welsh record-holder Ben Gregory at the England Athletics Senior Combined Events Championships in Bedford last month.
He represented Team GB in the heptathlon at an Indoor Combined Events International against four other countries in Madrid last year.
Mark Hookway of Tonbridge AC said: “This is great news for Lewis. Despite struggling with a calf injury in early season, he was able to manage that and continue training well, showing that dedication and consistency in training can pay off.
“He is certainly one of the hardest workers at the club, so he deserves every success.”
