F1 finishes this season with two races in Bahrain - the second on the Sakhir circuit's short outer ring - on November 29 and December 6 respectively, before completing the Covid-hit campaign in Abu Dhabi on December 13.
Alonso added: "I can't wait for next year, to be back racing, and meanwhile I will support the team in the final races and see you very soon."
Renault had hoped to be able to run Alonso in the current specification RS20 at the post-season young driver test, only for this plan to be met with opposition from rival teams, including McLaren and Racing Point.
Regulations surrounding the test stipulate drivers "must be in possession of an International A Licence; and unless otherwise approved by the FIA, not have competed in more than two F1 world championship races during their career".
Given two-time champion Alonso's F1 history, it appears unlikely - although not impossible - an exemption will be granted.
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