Ja-Cheoul of South Korea and Venezuelan Yohandry Orozco, plus Bayer Leverkusen's Germany international striker Patrick Helmes and Czech midfielder Jan Polak. The 21-year-old Koo -- who scored five goals in six matches at the recent Asian Cup -- signed a three-and-a-half-year deal from Korean side Jeju United, while 19-year-old Orozco signed from Venezuela's Zulia FC until 2015. Stoke also allowed former Chelsea and Barcelona striker Eidur Gudjohnsen to join English rivals Fulham on loan, with the Iceland international having failed to win a regular place since his pre-season move from Monaco. German rivals Schalke signed Iran international midfielder Ali Karimi, who worked with coach Felix Magath when they were both at Bayern Munich, plus clubless Greece striker Angelos Charisteas -- who scored the winning goal in the final of Euro 2004. Serie A leaders AC Milan confirmed on their website the signing of 34-year-old Italy defender Nicola Legrottaglie from league rivals Juventus, on a contract until June this year. Italian champions Inter Milan have signed Japan leftback Yuto Nagamoto on loan from Cesena on loan for the rest of this season, with 20-year-old Italy international defender Davide Santon moving in the opposite direction. The 24-year-old Nagamoto set up the only goal of the Asian Cup final against Australia on Saturday which sealed a record fourth title for the Blue