Due to lack of sponsorship Eltahhan couldn't make his professional debut until the 2017 English Open. His only match win during the season came at the single-frame Shoot-Out event, although he impressed at the 2017 UK Championship, battling world number 1 Mark Selby before ultimately losing 4–6; Selby praised his opponent afterwards, saying that Eltahhan played like a top-32 player. Eltahhan failed to win a single match during the next season, which ended with a 10-0 whitewash at the hands of Liang Wenbo at the 2019 World Championship qualifying rounds, and thus was relegated from the tour.