Costa's drawn out move from Chelsea completed Thursday but he can only watch from director's box as Atletico beat Sevilla 2-0
Diego Costa watches as Yannick Carrasco and Antoine Griezmann fire Atletico Madrid into second
Diego Costa watched on from the directors' box as Atletico Madrid leapfrogged Sevilla into second in the Primera Liga thanks to goals from Yannick Carrasco and Antoine Griezmann in a 2-0 win at the Wanda Metropolitano on Saturday.
Costa's drawn out move back to Atletico from Chelsea was finally agreed on Thursday, but the striker isn't allowed to feature until the January transfer window opens.
However, the man who fired Atletico to La Liga in 2013/14, could still have a vital part to play in Atletico's title challenge.
The hosts' maintained their impressive start to the season despite the difficulties of a ban on registering new players and with their first three league games of the season away from home as a new 68,000 capacity home was completed.
"We are happy that a player of his stature wants to come to Atletico Madrid," Atletico manager Diego Simeone said of Costa's return.
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Sevilla travelled to the Spanish capital unbeaten so far this season and came close early on when Pablo Sarabia's shot was deflected onto his own post by Stefan Savic.
At the other end Filipe Luis then smashed the underside of the bar from Carrasco's cutback in Atletico's best effort of a first-half short on clear-cut chances.
"In the first half we found it more difficult and they controlled the game," added Simeone.
"But you could see with Carrasco, Griezmann and Filipe that if we got the final pass right we could win the game.
"At the start of the second half we got the goal that put us on the right track."
It took less than a minute of the second period to break the deadlock when Carrasco showed great awareness and pace to latch onto a short back pass from Steven N'Zonzi to beat Sergio Rico to the ball, round the keeper and slot into an empty net.
Griezmann then made the game safe 20 minutes from time as the French international won a tackle inside the Sevilla box before lifting himself off the floor to receive Luis's pass and drill through Rico's legs.
Simeone then quickly withdrew Griezmann and Carrasco to keep them fresh for Wednesday's visit of Chelsea in the Uefa Champions League.
But Atletico comfortably saw out the final stages to move to within a point of La Liga leaders Barcelona, who travel to Girona later on Saturday.
Real Madrid are also in action later at Alaves as they aim to close a seven-point gap on Barca following a shock 1-0 home defeat to Real Betis in midweek.