Samurai. Inter coach Leonardo has allowed Colombian defender Nelson Rivas to join Ukrainian side Dnipro Dnipropetrovsk on loan, with a view to a permanent deal. Brazil-born Italy international striker Amauri has returned to Parma on loan from Italian rivals Juventus, who have replaced him with Cagliari's Alessandro Matri. English club Birmingham City signed Nigeria international Obafemi Martins in a six-month loan deal from Russian side Rubin Kazan, after the former Newcastle striker was granted a work permit. Portugal international striker Liedson has returned to the country of his birth after joining Brazilian club Corinthians from Sporting Lisbon in a $2.9 million deal. The 32-year-old qualified for Portuguese nationality in 2009 and played for his adopted nation at last year's World Cup finals in South Africa. Ecuador midfielder Jefferson Montero has swapped Spanish clubs after joining struggling Levante from Champions League hopefuls Villarreal on loan. Dutch club Feyenoord have signed Denmark international striker Soren Larsen from French side Toulouse on loan for the rest of this season, along with Arsenal's new 18-year-old Japanese forward Ryo Miyaichi and Borussia Monchengladbach midfielder Marcel Meeuwis.