The Yellow Submarine have picked up just three points from their first four games of the new La Liga season to sit down in 15th spot in the table, while Almeria are 19th, boasting just one point this term.
Match preview
Villarreal sacked Quique Setien as head coach in the aftermath of the 3-1 loss at Cadiz before the international break, with three defeats from the team's first four league matches seeing a change being made.
Real Madrid Castilla boss Raul was strongly linked with the position, but Pacheta has been appointed as the new manager, with the 55-year-old returning to work in La Liga, having lost his job at Real Valladolid in April.
Villarreal's only win this season was a 1-0 success at Mallorca on August 18, losing at home to both Real Betis and Real Madrid, in addition to the 3-1 reverse to Cadiz earlier this month.
The Yellow Submarine will start their Europa League group-stage campaign against Panathinaikos next week, while they will also take on Rennes and Maccabi Haifa in what is an open Group F.
Villarreal, who finished fifth in Spain's top flight last season, are certainly better than what they have shown early in the season, and a win over Almeria could act as a springboard for the weeks ahead.
Almeria lost both La Liga matches against Villarreal last season, while they have not beaten Sunday's opponents in Spain's top flight since May 2010, which is an indication of the size of their task here.
La Union narrowly avoided relegation from La Liga last season, finishing 17th in the table, just one point above 18th-placed Real Valladolid, and the early indications are that it could be another tough campaign.
Indeed, Vicente Moreno's side have picked up just one point from their opening four matches, which has left them in 19th position, with only Sevilla performing worse at this stage of the campaign.
Almeria lost back-to-back home games against Rayo Vallecano and Real Madrid before drawing 1-1 at Cadiz on August 26, but they lost 3-2 at home to Celta Vigo before the international break.
UDA recovered from a two-goal deficit to level the scores courtesy of efforts from Sergio Akieme and Sergio Arribas, but Celta scored an 87th-minute winner in the contest at the Power Horse Stadium.
Villarreal La Liga form:
Almeria La Liga form:
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Team News
Villarreal will be missing Alfonso Pedraza through suspension on Sunday, with the Spaniard handed a straight red card in the first half of the clash with Cadiz last time out.
Alberto Moreno and Francis Coquelin are also definitely out through injury, while Ben Brereton Diaz and Alexander Sorloth face late fitness tests.
Sorloth was injured in the first half of the match with Cadiz, and if he is unable to recover, there should be a starting role for Jose Luis Morales, while Dani Parejo and Etienne Capoue could be introduced in the middle of midfield.
As for Almeria, Martin Svidersky remains a long-term absentee due to a knee injury.
The visitors are otherwise in good shape in terms of their squad, with Edgar Gonzalez available again after sitting out the loss to Celta last time out through suspension.
Gonzalez should return in the middle of the defence, while there are likely to be two further changes, with Dion Lopy and Arribas both in line for starts after appearing off the bench last time out.
Villarreal possible starting lineup:
Jorgensen; Foyth, Albiol, Cuenca, Femenia; Baena, Parejo, Capoue; Morales, G Moreno, Pino
Almeria possible starting lineup:
Maximiano; Pubill, Gonzalez, Kaiky, Akieme; Robertone, Lopy; Embarba, Arribas, Ramazani; Suarez
We say: Villarreal 2-1 Almeria
There are likely to be a lot of nerves in the Villarreal camp heading into this match, but it is a kind fixture for the Yellow Submarine against a side below them in the table. We are expecting this game to be tight in terms of the scoreline but are backing Villarreal to navigate their way to an important win.