Borussia Dortmund has new coach Niko Kovac and some new players and needs to improve fast in the Bundesliga this weekend.

T he winter transfer window has closed as quickly as it opened, and without doing making any marquee or blockbuster signings, Bayern Munich still did do a fair amount of business.

Mikel Arteta’s side have also been widely tipped to sign Real Sociedad and Spain midfielder Martin Zubimendi, who is expected ...