Born in Sanet y Negrals, Province of Alicante, Valencian Community,[3] Femenía was a product of Hércules CF's youth ranks.

He made his first-team debut on 15 June 2008 at just 17, appearing in a Segunda División match at Cádiz CF, a 1–1 draw which eventually certified the Andalusians' relegation even though they protested against the illegal fielding of an opposing player, specifically the youngster.

[5] In the subsequent off-season, he signed his first professional contract after agreeing to a five-year deal[6] and, the following campaign, still only 18, he would be a much more important midfield unit, being the first substitute for veteran Francisco Rufete and totalling nearly 1,000 minutes in the league to help the club return to La Liga after an absence of 13 years.

[3] On 28 August 2010, Femenía made his debut in the top division, replacing Abel Aguilar in the second half of the home fixture against Athletic Bilbao.

[22] Femenía scored his first league goal for the English club on 31 March 2018, helping the hosts earn one point after a 2–2 home draw with Bournemouth.