De Tomas, 23, is the second-top scorer in the Segunda Division with 20 league goals.
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Nery Castillo has announced his retirement from the sport to take on a new venture, Nery's Fishing, a store in Greece dedicated to anglers.
Ukrainian international Roman Zozulya is clubless after being linked to a neo-Nazi group. But is he just the victim of 'fake news'?
"Zozulya will train with Real Betis while other existing options are studied so that he can join another team," Rayo said.
Zozulya's Spanish agent had asked Rayo for more time to work in order to find the player another club.
Lorenzo said that Zozulya had been granted special dispensation by FIFA to be allowed to join a third club this season.
The Spanish league has taken legal action against 10 people for threatening Roman Zozulya after his loan move to Rayo Vallecano last week.
Zozulya's recent transfer from Real Betis to Rayo Vallecano was called off after protests about the player's claimed links to radical groups.
Zozulya was expected to announce his decision on Monday but the player had decided to wait a little longer.
"I am not afraid for myself, but here I do fear for my family," Zozulya said.
Real Betis players showed their support for Ukrainian striker Roman Zozulya, who returned to the club after a failed transfer to Rayo Vallecano.
Manchester City midfielder Bruno Zuculini has joined Hellas Verona on loan for the rest of the season, linking up with his brother Franco in Serie B.
De Sart, who joined Boro in the 2016 winter window has been allowed to leave after making only one start for the club.
Former Villarreal manager Marcelino has demanded a public apology from Rayo Vallecano president Raul Martin Presa.
Southampton goalkeeper Paulo Gazzaniga has joined Rayo Vallecano on a season-long loan.
Javier Tebas said La Liga decided to launch a probe after it noticed "abnormal" movements in the betting market for the match.
Atletico Madrid kept their Primera Division title bid going with another 1-0 win but they were made to work hard for the victory by Rayo Vallecano.
Real Madrid have confirmed that Karim Benzema has suffered a hamstring injury, making the striker a doubt for Saturday's match against Real Sociedad.
Gareth Bale inspired Real Madrid to come from two goals down to win 3-2 at Rayo Vallecano in a testing workout ahead of their Champions League semi.
A club statement said that Bale had rejoined the group and included photos of him training.
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