Villarreal go into the 15th round of Primera Liga fixtures in third spot, level on 28 points with second-placed Barcelona and four adrift of leaders Real Madrid - at the other end, Betis are 19th in the 20-team league with only 11 points from their 14 games.
"Betis are an opponent who are in a bad moment, but with the change of coach all the players are going to try and win themselves a place in the team and they are going to make it difficult for us," said Tomasson. "The teams who close up a lot at El Madrigal are those who we have more trouble with."
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