"Happy New Year to all! And it's off to a great start for me because it means getting back on the field," the 28-year-old Ivory Coast international wrote on Twitter, posting images of himself working out at the gym.
German side Dortmund signed Haller for an initial fee of 31 million euros during the close season after the striker scored 34 goals last season for Dutch champions Ajax.The club are sixth in the Bundesliga, nine points behind leaders Bayern Munich. The season resumes later this month, with Dortmund taking on Augsburg on Jan. 22.
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