Atletico Madrid are reluctant to enter the ugly row between Diego Costa and Chelsea, leaving the striker sweating on a dream return to Spain. The bad blood between Costa and the Premier League champions took an explosive turn this week following Sportsmail's world-exclusive interview with the Spaniard. Costa has made it clear the only club he wants to join is Atletico, where he would be reunited with Diego Simeone in the Spanish capital. But the fiery feud between Costa and Chelsea is threatening to scupper the 28-year-old's dream of a return to Madrid. While Atletico retain a concrete interest in re-signing Costa this month, there is a hesitation from club chiefs to get involved in the argument.