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Schalke have signed central defender Felipe Santana from local rivals Borussia Dortmund on a three-year contract.
The Brazilian requested a transfer from Dortmund earlier this week and the Champions League finalists did not want to stand in his way.
Schalke defender Christoph Metzelder has confirmed he will retire at the end of the season.
The 32-year-old former Germany international will hang up his boots after Saturday's trip to Freiburg.
"I am just being honest with myself and I feel that I am no longer physically able to play consistently at this level," he said.
"And after 13 years, the fire inside me, which is necessary for this job, has burnt out."
Schalke 04 midfielder Julian Draxler has signed a new contract with the Bundesliga club until 2018.
The 19-year-old has committed himself to Schalke, with whom he started his career aged seven, going on to become the youngest player ever to reach 100 appearances for them.
– Schalke striker Klaas Jan Huntelaar speaking to Kicker magazine
I am definitely staying.
I feel great here and in the Bundesliga.
I've never experienced a better atmosphere anywhere else.
Not playing in Europe at all would be a catastrophe for us players and for the club.
But I don't think it will come to that. I am totally focused on fourth place.
Schalke teenager Julian Draxler is flattered by reported interest from Real Madrid and admits it would be a "dream" to play for the Spanish giants.
– Julian Draxler, speaking to Marca
Real Madrid are one of the world's great clubs, it makes me proud that they like my style of play. I would be a dream to play at Real Madrid.
I've always said that I would like to play in Spain. Every weekend I try to see the matches involving Madrid and Barcelona. I never miss the Classicos.
Right now I'm with Schalke and I have a contract until 2016.
I'm having a very good season and I'm doing very well, I've scored eight goals in the Bundesliga and I feel very happy.