Chelsea boss Jose Mourinho is planning a summer swoop for Atletico Madrid midfielder Koke. The club's technical director Michael Emenalo travelled to Spain on Saturday to watch the 23-year-old during Atletico's 2-1 victory against Deportivo, according to Spanish newspaper AS. The highly-rated Spaniard signed a long-term deal with Diego Simeone's side only last year, but Mourinho is reportedly planning to offer second-choice left-back Filipe Luis to his former club as a makeweight for the deal. Chelsea boss Jose Mourinho could be planning a summer swoop for Atletico Madrid midfielder Koke (above) Spanish newspaper AS report that Mourinho could offer Filipe Luis in a part-exchange deal this summer . Luis has struggled to make an impact at Stamford Bridge this season after failing to displace Spanish defender Cesar Azpilicueta from the left-back spot. AS also report that Koke's release clause is around £50million which Chelsea could be willing to shell out as Mourinho looks to add to a midfield that has looked tired at times this season. Koke, an Atletico academy graduate, was instrumental as the club reached the final of the Champions League before losing to local rivals Real Madrid last season and has . Koke in action during Atletico's 2-1 La Liga victory against Deportivo on Saturday . Chelsea defender Filipe Luis (right) could be set for a move back to his former club .
Jose Mourinho reportedly targeting summer move for Koke .
Spanish midfielder has been key to Atletico Madrid's recent success .
Former Atletico defender Filipe Luis could be going back to Spain .