Please rewrite this title in German and exclude the domain name: Official: Borussia Dortmund sign Serhou Guirassy from Stuttgart

Summarize this content in well-structured paragraphs in German language and keep HTML tags
Dortmund have got their new striker as they have completed the signing of Serhou Guirassy from Stuttgart. The club triggered the release clause of the player which was €17.5 million. The medical has been completed and the striker has signed his contract with BVB last night.
Borussia Dortmund has updated their attacking lineup with the buy of Serhou Guirassy from Stuttgart, completing a significant transfer deal. The club exercised Guirassy’s release clause, valued at €17.5 million, to secure the services of the talented striker.
The finalization of the deal included a successful medical examination, ensuring Guirassy’s fitness to join the squad. The French forward formally inked his contract with BVB late last night, marking an important step forward for both player and club.
Guirassy, known for his prowess in front of goal and physical presence on the field, arrives at Dortmund with high expectations. His addition is expected to provide valuable depth and firepower to Dortmund’s attacking options, offering a new dimension to their offensive strategy for the upcoming season.