VfB Stuttgart striker Serhou Guirassy is joining Borussia Dortmund from VfB Stuttgart, two newspapers in the southern German city reported on Wednesday. The Guinea forward scored 28 goals in the Bundesliga last term to help Stuttgart stun the Bundesliga and finish second. But he has an exit clause in his contract and can leave for a reported €18 million ($19 million). The Stuttgarter Nachrichten und Stuttgarter Zeitung newspapers reported that the 28-year-old had activated the exit clause and was in the final stages of signing for Champions League runners-up Dortmund, who only finished fifth i…