Top January transfers in the Bundesliga

Bojan Krkic has moved to Mainz on loan from Premier League side Stoke City for the rest of the season. The 26-year-old Spanish attacker is a product of Barcelona's youth academy and when he made his debut in the first team at the age of 17, was seen as the next Lionel Messi. Since then he has become something of a journeyman, spending spells at Roma, AC Milan and Ajax.

Billed as the "new Ibrahimovic," the young striker was on the verge of signing for Real Madrid before opting for Dortmund at the last minute. Just 17 years old, he recently became the youngest-ever player to score for the Swedish national side. Big things are expected of him in Dortmund but he has the small matter of competing for a place with Pierre-Emerick Aubameyang to deal with.

The Bundesliga new boys took advantage of their connections and swooped in for French teenager Dayot Upamecano from Red Bull Salzburg. The much-coveted French teenager follows the path trodden by Naby Keita to great effect. Pacy and powerful in the air, he has the potential to become one of the best center backs in the world.

The record champions bolstered an already world-class defense further still with the signing of Niklas Süle from Hoffenheim. The 21-year-old is already a full international and will link up with his Germany teammates Jerome Boateng and Mats Hummels at the heart of Bayern's backline when he moves at the end of the season.

Süle will be followed to the Allianz Arena in the summer by teammate Sebastian Rudy. In six-and-a-half years at Hoffenheim, Rudy made almost 200 appearances and caught the eye of national-team coach Joachim Löw. Comfortable in the center or right of midfield, he can also play right back.

After a raft of crippling injuries over the past few seasons, central defender Holger Badstuber is approaching the last-chance saloon in the Bundesliga. The move to Schalke on loan until the end of the season looks like a sensible one as parent club Bayern Munich have moved for Niklas Süle in his position. But he will have to prove his body can still withstand top-flight football.

Joining Badstuber in Gelsenkirchen is Wolfsburg winger Daniel Caligiuri. An integral part of the Wolves side that won the German Cup in 2015, Caligiuri is not the only Wolfsburg player to have struggled this season. The versatile Caligiuri will fill the hole left by a long-term injury to Abdul Rahman Baba.

With Klaas-Jan Huntelaar out injured for much of this season, Schalke have been lacking firepower up front. Guido Burgstaller could not have gotten off to a better start following his move from second-division side Nuremberg. The Austrian striker grabbed a last-minute winner at home to Ingolstadt on his debut.

No-nonsense central defender Mergim Mavraj has never been one to shy away from a scrap. And those battling qualities are exactly what Hamburg need as they face another season mired in the relegation dogfight. The Albanian central defender came from high-flying Cologne.

Wolfsburg moved for the German-born Turkey international following the departure of Julian Draxler to Paris St-Germain. In five seasons at Mainz, Malli developed into one of the Bundesliga's most potent attacking midfielders. Creative, tricky and with a keen eye for goal, he could prove to be the signing that turns Wolfsburg's fortunes around.

Joining Malli in the forward line at the Volkswagen Arena is French winger Ntep. The pacy winger (pictured here with Hamburg's new loan signing Kyriakos Papadopoulus) made an instant impression on his debut, setting up the winning goal against northern rivals Hamburg.

One of the busiest Bundesliga clubs this transfer window, Wolfsburg also secured the services of Dutch midfielder Riechedly Bazoer. A product of the famous Ajax academy, the 20-year-old was chased by a host of top clubs and is tipped for greatness.

With a tongue-twisting name like that, it's a good job the French defender is happy to go by 'Kolo.' Although he played for France at every youth level, he has yet to receive full international honors. But he does arrive in Germeany with a Europa League winner's medal to his name. A left-footed central defender, he can also play at fullback.

It's not often you travel south to get Bremen, but Danish midfielder Thomas Delaney did just that when he swapped FC Copenhagen for the Bundesliga. As captain of his home-town club, he won several titles, appeared in the Champions League and went on to represent his country.

The USA international swapped life at the top with RB Leipzig for the mother of all relegation battles with bottom-side Darmstadt. The powerful striker never really made the breakthrough at Leipzig and will be keen to add his muscle to the fight at the wrong end of the table.

Serbian international Neven Subotic has joined Cologne on a six-month loan from Borussia Dortmund. Where his future will lie after that is anybody's guess. The 28-year-old will bring some added experience to Cologne's central defense.