[11] On 25 April 2009, this time as a starter,[12] Hernández fired the hosts into the 2–1 lead against Barcelona, following a run between four players and a one-two with Juan Mata; the match ended 2–2.

[14] Fully established in the starting XI now over Joaquín, he continued to produce fine displays during the campaign, including a 40-meter lob to help defeat Almería 3–0 away.

[15] Hernández scored twice against Club Brugge in extra time of the UEFA Europa League round-of-32 second leg game played at the Mestalla on 25 February 2010, for a 3–0 win (3–1 on aggregate).

[20] He was named to the team of the week published on 3 September by Sky Sports,[21] and started in the final of the Football League Cup on 24 February 2013, helping to a 5–0 rout of Bradford City.

On 2 August 2016, Hernández signed with Championship club Leeds United on a six-month loan deal, with the option of a permanent move in January 2017, linking up with former Swansea manager Garry Monk[25] and being given the number 19 shirt.

[26] After the former failed to receive his paperwork in time from the Qatar Football Association for the opening fixture against Queens Park Rangers (which ended in a 3–0 defeat),[27] he made his debut on 10 August in a 3–2 win at Fleetwood Town in the EFL Cup.

[46] His two crucial match-winning goals at home in early 2020 against Millwall[47] and Reading were key to maintaining sustained pressure on West Bromwich Albion at the top of the table.

[50] Hernández returned to Spain after five years on 20 July 2021, joining hometown club Castellón who had been recently relegated to the newly created Primera División RFEF; a three-year contract was signed.

[52] After close observation by Spain national team manager Luis Aragonés during his time at Getafe, Hernández was picked for the 32-man provisional squad for UEFA Euro 2008, but did not make the final cut.

On 5 June 2009, he was called to represent the country at the 2009 FIFA Confederations Cup in South Africa as a replacement for injured Andrés Iniesta, by new boss Vicente del Bosque.

[55] In 2016, the Yorkshire Evening Post described Hernández as the "most creative player in the Championship," due largely to his runs behind the defence, skill at picking out dangerous passes in open play and aptitude at taking corners and other free kicks.