BERLIN -- Borussia Dortmund signed Serbian midfielder Milos Jojic and Werder Bremen presented attacking midfielder Ludovic Obraniak in the Bundesliga's most eye-catching deals on Friday as the transfer window closed.
Wolfsburg playmaker Diego completed his return to Atletico Madrid, where the Brazilian spent a successful loan season in 2011/12, for a reported fee of 1.5 million euros ($2 million).
Diego's contract with Wolfsburg was to expire at the end of the season and the Volkswagen-backed club had already brought in a replacement in Belgian midfielder Kevin de Bruyne. De Bruyne proved to be the biggest winter arrival to the Bundesliga following his switch from Chelsea for a fee reported to be around 20 million euros ($27 million).
Dortmund reached agreement with Partizan Belgrade for a reported fee of around 2.2 million euros ($3 million) for the 21-year-old Jojic, who signed a contract through June 2018 with his new club.
"We are very pleased to have signed such a versatile midfielder with enormous potential to complete our squad," Dortmund sporting director Michael Zorc said.
Jojic had been the standout performer in the Serbian first division with six goals and seven assists in 15 games before the winter break.
He also scored on his Serbia debut in a friendly against Japan in October, his only international appearance to date.
Jojic provided Dortmund with another option following the season-ending injury to Poland midfielder Jakub Blaszczykowski and Germany midfielder Ilkay Gundogan's ongoing back problems.
Bremen's capture of Obraniak from Ligue 1 side Girondins Bordeaux came at the "right time," according to the player.
"For me it's a whole new step. I've only played in France up to now," said the 29-year-old Obraniak, who signed through June 2016.
Obraniak previously played five seasons at Metz before switching to Lille in 2007. He helped Lille to the league and cup double in his first season and joined Bordeaux in January 2012.
The French-born player has made 32 appearances for Poland.
"I feel French but also have Polish blood. It's an honour to play for the Polish national team," Obraniak said at his Bremen presentation.
Relegation-threatened Nuremberg signed Spanish youth international Jose Campana on loan from English Premier League club Crystal Palace with an option to buy at the end of the season.
"He can play in many positions across midfield," Nuremberg chairman Martin Bader said of the 20-year-old former Sevilla player.
The Hamburger Abendblatt newspaper reported that Hamburger SV had signed former Germany defender Patrick Owomoyela to the end of the season. The 34-year-old Owomoyela had been without a club since his Dortmund contract expired last summer.
Croatian striker Srdjan Lakic returned to second-division Kaiserslautern on loan from Eintracht Frankfurt, where he was on loan to the end of the season from Wolfsburg.
Lakic previously played for Kaiserslautern between 2008-11.
Hoffenheim also cut its wage bill, by letting Matthieu Delpierre go on a free transfer to Dutch side Utrecht. He was the fifth player to depart the club in January - the most for any German club.
Altogether, the 18 Bundesliga clubs signed 33 new players in the winter transfer window, while 40 left.
Germany's dpa news agency estimated that almost 40 million euros ($54 million) was spent, with around 13.5 million ($18.2 million) recouped through sales.