The German was speaking after the 1-1 draw with Southampton on Saturday.
"Even then, we need to use these ball wins from N'Golo and use them better to attack the space behind the last line better. We need to use our speed better to create more chances. There are a lot of possibilities in the last matches.
"We need to understand and it is a process that we may need the last few links to gain the confidence to create and score more. Because it is also not enough to score from just half chances."