Ritchie Jones has left Bradford City by mutual consent to look for more first team opportunities.
The 26-year-old joined the Bantams on a free transfer in July 2011 but failed to secure a regular first team berth this season, making ten appearances.
Bradford boss Phil Parkinson said the player has left with the best wishes of the club.
He told the club's official website: "Ritchie recently expressed a desire to try and play more first-team football.
"Unable to promise that for him here, I didn't want to stand in his way in his search for more games.
"Ritchie leaves the football club with our best wishes."
Jones will be able to move to another club outside the transfer window as a free agent.
Two spot-kicks from home striker Diego Costa sandwiched a penalty from Sevilla hitman Alvaro Negredo as Atletico earned a narrow lead to take to the Ramon Sanchez Pizjuan for next month's second leg.
The men to see red were Sevilla duo Emir Spahic and Fernando Navarro, and Atletico defender Diego Godin.
Spahic was the first to go in the 48th minute, being shown a second yellow card after clumsily handling the ball as he fell in front of Costa in the area, with the Atletico striker slotting home the resulting penalty.
Atletico's lead and numerical advantage lasted just eight minutes though as Godin was given a straight red card after Negredo's goal-bound chip over Thibaut Courtois struck the covering defender's hand.
Negredo, who had been linked with a move away from Sevilla on transfer deadline day, duly slotted home from 12 yards to make it 1-1.
Atletico were awarded their second penalty in the 70th minute in almost identical fashion to their first, with Navarro the man to handle the ball this time as he fell in front of Costa. The Brazilian striker went the same way with his penalty and again found the back of the net.
There was a third red card with five minutes remaining with Navarro dismissed after scything down Costa as he threatened to break clean through.
The winner of this match will play either Barcelona or Real Madrid in the final, with that tie level at 1-1 following Wednesday night's first-leg.
