Diakhaby had been involved in a heated exchange with Cadiz's Juan Cala before indicating to the referee David Medie Jimenez that he was leaving the field.
Forward Maxi Gomez equalized late for Valencia to draw with Cadiz 1-1 at home in the Spanish league.
Eibar remains winless in seven home games in the league this season
LaLiga rules allowed Atletico to buy outside the transfer window after Arsenal activated Thomas Partey's 50 million euro release clause on the last day of the summer transfer window.
Javi Gracia has witnessed something of a firesale this summer at Valencia, with several key players sold and not a single new signing made ahead of the team's opener against Levante on Sunday.
Valencia were starting their pre-season preparations this week under new coach Javi Gracia, who was appointed two weeks ago following the sacking of Albert Celades in June.
Premier League: Arsenal blow two-goal lead to draw against Watford; Callum Wilson brace powers Bournemouth to win over Everton
Arsenal played a huge part in their own downfall too as they gifted possession away inside their own box for Tom Cleverley to pull a goal back before David Luiz upended Roberto Pereyra, who slotted home the resulting penalty
Premier League: Watford fire manager Javi Gracia, re-appoints Quique Sánchez Flores for second spell as manager
In his previous stint with the club, Sánchez Flores could take Watford only to the FA Cup semifinals and a 13th-place finish in the league
League Cup: Watford can use second-round Coventry clash as launching pad for Premier League, says manager Javi Gracia
A 3-1 home loss to West Ham United on Saturday heaped the pressure on Gracia but the Spaniard says Watford can use the Cup match to iron out their problems before getting back to league business at Newcastle United
Premier League: From favourite Frank Lampard to Massimiliano Allegri, 5 managers who could replace Maurizio Sarri at Chelsea
Having guided Derby to the success of the Championship playoff in his first full season, losing out on promotion to the Premier League beaten by Aston Villa, Frank Lampard is in pole position among the candidates.
FA Cup: Peerless Manchester City complete historic treble as Pep Guardiola lays foundation for future domination
Manchester City now have the domestic treble, but the FA Cup final will, unfortunately, be remembered for Watford's PlayStation-like football.
FA Cup 2018-19: Domestic treble-chasing Manchester City start as favourites against defensively porous Watford
Manchester City are on the brink of a domestic treble while their opponents Watford are on a downward slope after a positive start to the campaign.
Premier League: Watford's Jose Holebas to play in FA Cup final after red card decision in loss against West Ham overturned
Watford defender Jose Holebas is available for Saturday's FA Cup final against Manchester City after his red card in the 4-1 home defeat to West Ham was rescinded.
Premier League: Injured Watford duo Roberto Pereyra, Isaac Success expected to make returns against Cardiff City
Pereyra, Watford’s top scorer in the league with six goals from 24 starts, and Nigeria’s Success last played in the club’s 2-1 defeat at Tottenham Hotspur in late January
Premier League: Watford manager Javi Gracia signs new four-and-a-half deal after impressive start to season
The new deal commits Garcia to the club until 2023, with the option for a further three years. The 48-year-old was named Barclays Premier League manager of the month in August
Premier League: Liverpool cruise past struggling Cardiff; Bournemouth, Watford continue fine starts to the season
Sadio Mane scored twice as Liverpool took advantage of their title rivals' inactivity to go three points clear at the top of the Premier League with a 4-1 win at home to Cardiff on Saturday as Bournemouth and Watford both continued their fine starts to the season.
Premier League: Watford's Javi Gracia named manager of the month; Lucas Moura wins best player award for August
Watford manager Javi Gracia has been named August’s Premier League manager of the month after guiding the club to a winning start this season.
Watford's stunning start to the season hit a new high as they made it four successive Premier League wins with a shock 2-1 success against Tottenham on Sunday.
Premier League: Pep Guardiola says Jose Mourinho deserves respect despite Manchester United's troubled start to season
Pep Guardiola said his old rival Jose Mourinho deserves respect despite Manchester United's troubled start to the Premier League season.
Premier League: Arsene Wenger admits concern over empty seats at Emirates, says fans' frustration 'understandable'
Arsene Wenger conceded he could understand why Arsenal supporters are so frustrated by their team's wretched run.