Mercedes GP boss Ross Brawn says he has been encouraged by the progress made by his team in the last two races despite the lack of results.
"Monaco was a frustrating race for the team where we did not achieve our potential," said Brawn. "We had a competitive and reliable car which proved to be the quickest in the race at various stages, we performed two excellent pit stops, one of which was the quickest of the race, but ultimately we did not deliver the results that we would have hoped for.
"However, I am encouraged that we have made progress over the last two races and that we have identified our areas of weakness which we are working hard to rectify."
Mercedes scored just 18 points in the last two races thanks to a fourth place by Michael Schumacher in Spain and a seventh for Nico Rosberg in Monaco.
Brawn also confirmed the team will return to using the longer wheelbase car after running the shorter version in Monaco, and that an updated F-duct will be introduced.
"We have some major and very challenging upgrades for the next few races which have been made possible by the commitment and hard work of everyone at the factory over the past weeks. In Turkey, we will return to our previous suspension system and longer wheelbase car, we have the latest iteration of our 'F-duct' rear wing, plus further aerodynamic developments," he said.
"It's a long road ahead to achieve the level of competitiveness that we are aiming for, but each race is a step along the way and I am confident that we will get there."