David Coulthard, who retired from F1 last year, will instead take the role of Red Bull’s third driver and will return to the cockpit if Mark Webber, Sebastian Vettel, Sebastien Bourdais or Sebastien Buemi are unable to race.
Red Bull is expected to re-appoint Hartley to the reserve driver role once the opening rounds of the season are complete.
Coulthard is working for the BBC as a pundit this year, so he will already be present at all the races.
Read more: Brendon Hartley gets dual F1 test role
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