Borussia Dortmund have signed Dutch defender Ian Maatsen on loan from Chelsea, the Bundesliga club said on Friday. “Ian fits our requirements with his strengths. He’s a player who brings a lot of pace, has a strong left foot and can also play in several positions. We’re delighted that we were able to conclude this loan before our first Bundesliga match of the year,” sporting director Sebastian Kehl said. Maatsen is the second signing for Dortmund in the current winter transfer. On Thursday, the club brought back Jadon Sancho on a loan from Manchester United. “Dortmund made an intensive effort …