Munich coach Thomas Tuchel reacts after the the Bundesliga soccer match between SC Freiburg and Bayern Munich at the Europa-Park Stadium in Freiburg Im Breisgau, Germany. AP
The deal was extended automatically by one year after the 30-year-old England defender satisfied a clause in his contract to play a minimum number of games.
Speaking with broadcaster DAZN before Bayern's match at Freiburg, Eberl said Dier is "definitely helping us."
Dier joined Bayern from Tottenham in January on a deal which had been set to run until the end of the season.
He has since played six Bundesliga matches for the German champions, starting four times.
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