Goals from Yoan Gouffran and Loic Remy ended the Blues' six-game winning streak with a 2-0 defeat at St. James' Park as they lost ground on Premier League table-toppers Arsenal.
"I think it’s normal that he was frustrated," Schurrle told the Daily Mirror. "We had a bad match and we didn’t play well. It’s only normal that the manager wasn’t very happy with us.
|7/1||Schalke are 7/1 with Coral to beat Chelsea on Wednesday|
"But it’s quite right when you lose, or don’t play that well, that the manager should criticise you. We know we have to reach the standards the manager wants from us, all the time.
"It’s not just about being 100 per cent and 100 per cent motivated in the big matches. At Chelsea you have to win, every match. Not just in the Premier League or the Champions League but the cups, too."
Schurrle has underlined the importance of getting back to winning ways against Schalke as Chelsea look to strengthen their chances of qualifying for the Champions League last 16.
He continued: "[Schalke are] a good team with good offensive players - Julian Draxler, Kevin Prince Boateng and Adam Szalai - but if we do our match, what we can do, we have to win at Stamford Bridge.
"We didn’t play well against Basel [losing at home in matchday one], which meant we were under pressure in the next games and had to win them.
"It is vital we go through, and if we can win this one we will be close to doing that."