Premier League clubs must act quickly if they're not to miss out on Dinamo Zagreb prospect Sime Vrsaljko.
Manchester City, Arsenal and Chelsea were all linked with the exciting 18 year-old midfielder during the January market.
But Kicker says Bayer Leverkusen have made a formal approach to Dinamo to open negotiations for Vrsaljko.
Croatian sources say Bayer are the first club to make an official move for the midfielder, despite the frenzied transfer speculation.
