Lewis Hamilton and Jenson Button's MP4-25's will sport small modifications to the front floor at the Italian Grand Prix.
McLaren have been forced to make the changes to ensure that the cars meet the new criteria that will be used during flexi tests at Monza.
The FIA introduced stricter wing tests at the Belgian Grand Prix following the furore over Red Bull and Ferrari's endplates and they will adopt a similar policy when it comes to floor tests in Italy.
"We haven't had to make any modifications to the front wings in terms of bodywork flexibility," Tim Goss, McLaren's chief engineer, said during a Vodafone McLaren Mercedes Phone-in.
"So those front wing options we have - of which we have a dedicated solution for Monza - those are all as we've run so far this season.
"As far as the bib is concerned then the new offset load test is a little challenging and we've had to make some minor modifications to make sure we're well inside the deflection limit that the FIA are going to set on that.
"We've modified our bib and taken opportunity to roll it up into a minor performance upgrade as well.
McLaren, though, are unlikely to be the only team to make changes, according to Goss.
"As far as the offset bib test is concerned then I would expect most teams will probably have to make changes to comply with that," he added.
"As far as articulated planks are concerned there are a number of teams that run floor skids in multiple pieces and the FIA have tightened up on that to ban articulated skid blocks and I would imagine other teams have had modifications for that.
"As far as the wings are concerned the evidence from Spa was, you'd have to say, was fewer cars running more flexible wings, although it's very subjective."
