Midfielder Nigel de Jong will continue his career with Mainz, the official website of the German club.
The 33-year-old Dutch, who earlier left Galatasaray as a free agent, signed an agreement with the Bundesliga club until the summer of 2018.
"We are very pleased that we managed to get such a quality player. His tremendous football experience and character will give the team an important impetus in the second half of the season, "said the sports director of Mainz, Rouven Schroeder.
After the first round, Mainz scored 17 points in 17 games and takes 15th place in the championship standings of Germany.
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