BVB Dortmund boss Thomas Tuchel says his side are still not completely fresh, despite just finishing their winter training camp.
Die Borussens spent much of their mid-season break in Dubai, playing friendlies against Frankfurt and Jeonbuk Motores, before returning to Germany to face Slavia Prague on Tuesday.
Dortmund won all three of those games, but Tuchel does not think his players are ready just yet and have work to do before the Bundesliga resumes this weekend.
"We had good and not-so-good spells – that's how it is when you play again on a Tuesday evening and are looking ahead to Saturday," Tuchel told the club's official website.
"We got another victory, that was our third game won. But there is still room for improvement in all areas.
"We are still not completely fresh, the competition and the atmosphere are still missing too. For the point in time we are at, we are looking good on the pitch.
"We have now had three friendly matches and we will definitely need more sharpness – but that will come in due course. Today you could see that in some situations we did not give it everything we had defensively to avoid risking injuries."