Kevin Magnussen and McLaren were fastest on the second day in Bahrain today as the teams gradually began to pick up the pace.
However, they are still far from the sort of lap times they are likely to achieve in full qualifying form come April.
Esteban Gutierrez will remain with Sauber for the 2014 Formula 1 season, the team has confirmed.
The 22-year-old Mexican will partner with Adrian Sutil, whose signing was confirmed earlier this week.
The announcement comes just days after FOXSports.com’s Adam Cooper reported the team had a “change of heart” and wanted to retain Gutierrez.