May 10 (GMM) Ferrari's F10 car will not feature its new F-duct system on the streets of Monaco this weekend.

The Italian team finally got its hand-triggered blown rear wing concept up and running for the Spanish grand prix and set highly competitive straight-line speeds.

But boss Stefano Domenicali said the car will feature the conventional rear wing and engine cover this weekend because Monaco requires the highest levels of downforce at all times.

He also backed Felipe Massa amid claims the Brazilian's struggle at the wheel of the F10 could cost him his seat for 2011.

"He is a great driver and we have to make him feel comfortable again with the car," Domenicali is quoted by Spain's AS newspaper.

He also played down suggestions the issue of tyre supply for 2011 is likely to be finally settled in Monaco this weekend.

"It is going to take another couple of weeks, although we will talk about it again in Monaco," Finland's Turun Sanomat quotes the Italian as saying.

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