Bayer Leverkusen will host Augsburg in a Bundesliga fixture at BayArena on Saturday.
The promising young Czech Republic striker could end up forming an exciting yet deadly partnership with fellow countryman Patrik Schick in the upcoming season.
Borussia Dortmund are now nine points adrift of the leaders Bayern Munich, with a five-point lead over third-placed Leverkusen.
The Iranian forward joins the Bundesliga club after spending nearly three seasons with Zenit Saint Petersburg.
Record-German champions Bayern Munich will host traditional rivals Borussia Mönchengladbach as Bundesliga resumes on Friday.
Michael Ballack's authority and versatility saw him become one of the standout players in the German national football team in the early and mid-2000s.
Tottenham Hotspur have announced the signing of goalkeeper Pierluigi Gollini from Italian side Atalanta on a season-long loan, with an option to make the transfer permanent.
Heung-Min Son has signed a new four-year contract with Tottenham Hotspur, which will run until 2025.
Winger Demarai Gray has agreed a three-year contract with Everton until the end of June 2024 with the option for a fourth year.
Manchester City became the eighth team to lose in their debut UEFA Champions League final.