He told BBC Sport: "There is always a danger of [complacency] as you want to enjoy the victory that you have earned, but you need to get everyone on board for Tuesday.
"We need to recover and hopefully we'll be ready and we need to perform again against Scotland. [The Germany win] gives us confidence; we've come up against the world champions and got a result.
"Scotland beat us here last time, so we'll have to be on our best."
Poland are currently top of Group D in their Euro 2016 qualifying campaign.