It is wrong to describe Mercedes' original 2010 car as the "old" one, Norbert Haug insisted on Wednesday.

Despite the German team only debuting its 'new' longer wheelbase version in Spain last weekend, it has been confirmed that Michael Schumacher and Nico Rosberg will be driving the previous specification this weekend in Monaco.

Team boss Ross Brawn said the team "will run our new aero package but we will revert to our previous specification suspension system to allow for the steering lock required around this unique circuit".

According to DPA news agency, Haug insisted: "There is no 'old' and 'new' silver arrows.

"There is one with a longer wheelbase, as used in Barcelona, and one with a shorter wheelbase, as used in the previous four races," added the German.