Martin Whitmarsh on Thursday played down reports McLaren is set to follow Mercedes and Lotus' lead by racing a 'double DRS' system this weekend at Spa.
But the Woking based team's boss did not deny McLaren designers are working on the straightline-speed boosting concept.
"We are not announcing when, where and if we are going to be introducing it," he told reporters during sponsor Vodafone's regular media teleconference.
"I think we will see different wing variants, certainly on our car along with a number of visual items as they go through scrutineering later today and hit the track on Friday.
"We will see new bits, but McLaren will not have a double DRS in Belgium," Whitmarsh said from Belgium.
He also refused to rule out a scenario where Jenson Button, who is 41 points behind teammate Lewis Hamilton's points tally with nine races to go, might eventually fall in line to support the sister McLaren's title charge.
But "It will be quite a few races before we make that decision," Whitmarsh - who insisted McLaren's long-standing policy of driver equality remained in place - said.
"There may well come a point (when team orders are used), but there are still many races left and many points on offer -- things can change quickly."