Ajax Amsterdam gave coach Martin Jol a winning start with a 2-0 success over Groningen in their opening game of the new Dutch league season on Sunday.
Unstoppable Bayern Munich forward Robert Lewandowski scored a hat-trick, taking his tally to 10 goals in five Bundesliga games, as the defending champions thumped hapless Eintracht Frankfurt 5-0 on Saturday.
France international Dembele scored 10 goals and provided 20 assists in all competitions to help Dortmund finish third in the Bundesliga last season. The team also won the German Cup.