Kubica has twice featured in a race capacity this season when standing in for Raikkonen in the Netherlands and at Monza after the Finn tested positive for Covid-19.
It is expected Kubica will once again complete a racing programme away from Formula 1 during the season with -year-old winning the European Le Mans title this season with WRT.
“We are delighted to extend our successful partnership with PKN ORLEN into its third year," said team principal Frédéric Vasseur.
"ORLEN are an instantly recognisable brand in a vast and growing market and they have proven a loyal supporter of the team; their presence underlines and reinforces our resolve to be one of the most attractive teams in the sport for global brands.
"Most importantly, we share a commitment to constant improvement, whether on track or in their business, and we are determined to keep growing together.
"Their activation campaign has been of the first order, reaching fans all over Europe and expanding access to the team and the world of Formula One and we can’t wait to unveil the next stages in this programme."
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