Lotus has confirmed that it will not race its double DRS device until Suzuka at the earliest.
The Enstone-based outfit had planned to debut the device at Spa, but was prevented from doing so by the Friday washout.
The team subsequently confirmed that it would not run double DRS at Monza due to the different aero configurations teams choose to run.
Lotus technical director James Allison has now announced that the cars will also appear in standard trim at Singapore.
"Although we would like to have it at Monza - because it is the type of circuit that rewards such a thing - we don't have the DRS device configured to cope with the Monza level of downforce," he said.
"So it is not even on the table. In Singapore you won't see it either, because it's too high a downforce circuit with insufficient straights for it to be worthwhile.
"The earliest you might see it now is Suzuka."
Despite the absence of double DRS Allison said he was confident the team could return to form at Monza, one weekend after it fell short of its victory hopes at Spa.
"Having made predictions about the last race that were not exactly on the mark, it's even harder to do so here," he explained.
"That said, if you took the season as a whole, we've got a fair hit rate of arriving at tracks and performing reasonably.
"In all probability it will be pretty warm and we've tended to go well when it's warm.
"We ought to be able to get our show back on the road in Monza after a slight misfire in Spa."
Team Principal Eric Boullier meanwhile promised that Lotus would continue to push its development of the E20 until the final race of the year.
"Quite a few interesting developments are still in the pipeline and they'll be implemented later in the year," he said.
"At this time of the year, the team usually starts focusing almost only on its next car.
"This is not the case this year, as we'll develop the E20 until the very last race - and that won't compromise the design of the E21."