Motor racing - Tost indicates Hartley and Gasly to stay for 2018

Oct 21, 2017; Austin, TX, USA; Toro Rosso driver Brendon Hartley (39) of New Zealand is interviewed after qualifying for the United States Grand Prix at Circuit of the Americas. Mandatory Credit: Jerome Miron-USA TODAY Sports

MEXICO CITY (Reuters) - New Zealander Brendon Hartley and French rookie Pierre Gasly are likely to be retained as Red Bull-owned Toro Rosso's Formula One lineup next season, team principal Franz Tost said on Friday.

"We want to test them for the rest of the season because there is a high possibility that this will be the driver lineup for 2018," the Austrian told reporters at the Mexican Grand Prix.