Germany cruised through their qualifying group for the World Cup, dropping only two points to emerge as one of the favourites for glory in Brazil, but Low says that may not be the case.
"On paper, we have a top team with top quality and top individuals, but the reality looks a little different," he said at a press conference on Monday.
"The truth is not so nice because many of our players have been injured for a long time and don't have much rhythm, be it due to a dip in form or niggling injuries, which is why we need to use these next two and a half months to improve and do everything to reach top form."
Low is once again without Mario Gomez, who has only just returned from a five-month injury lay-off with Fiorentina, while fellow Serie A striker Miroslav Klose is a doubt for Wednesday's friendly with Chile in Stuttgart.
Mesut Ozil is low on form, Bastian Schweinsteiger has not been able to play regularly over the past few months, Ilkay Gundogan is still missing with a back injury while Sami Khedira faces a race against time to be fit for May.
They were all key members of Low's team throughout qualifying, which is why the Germany coach is currently overcome with pessimism.
"The clock is ticking and I'm making an appeal to everybody to prepare as best as they can and to invest all they can, not only to be physically but also psychologically ready for this," he said.
"We need a very good basis and some of my players are still showing deficiencies."
It is with that in mind that Low called four new faces into his squad to face Chile.
Pierre-Michel Lasogga, Andre Hahn, Shkodran Mustafi and Matthias Ginter could all make their international debuts on Wednesday and Low made it clear he did not call them along just to make up the numbers.
"Anybody in my squad has the chance of coming to Brazil," Low said. "I know I'm going to have to hurt one or two people (with my final squad decision)."