McLaren have warned their test driver Gary Paffett not to try to use his role as a springboard to move to another team to race.
The young Briton joined the team this season following the exit of Alexander Wurz, who had made no secrets of his intention to return to racing if he struck a deal with another team.
The Austrian has joined rivals Williams as their third driver.
Paffett, last year's DTM champion, has been tipped as a future champion by McLaren CEO Martin Whitmarsh, but team chief Ron Dennis has warned him to stay focused on his testing role.
"He is a talented driver," Dennis said of Paffett. "There was a key ingredient in being a McLaren driver about why you are a McLaren driver.
"It is to be 100 percent committed to the team and if you are constantly restless and constantly seeking at every opportunity the ability to race in a rival team then there is no place for you in McLaren.
"It is as simple as that."