The sportswear firms claim the decision to ban the five-time grand slam champion was "flawed".
Two high-profile sponsors of Maria
Sharapova have vowed to stand by her - despite the tennis star being
banned for two years after admitting breaking anti-doping rules.
Her suspension has been backdated to 26 January this year,
which was when she provided a urine sample containing meldonium shortly
after a quarter-final match at the Australian Open.An independent tribunal found the 29-year-old had not deliberately broken the rules - but had taken the banned substance to enhance her performance and failed to make checks on the drug's legality.
:: What Is Meldonium? The Controversy Explained
Sharapova is hoping to have the sanction reduced on appeal, claiming it was "unfairly harsh" - and two of her sponsors agree.
"Maria has always made her position clear, has apologised for her mistake and is now appealing the length of the ban.
"Based on the decision of the ITF and their factual findings, we hope to see Maria back on court and will continue to partner with her."
At the time of the failed test the sportswear firm said it was putting its £48m deal on hold.
:: Analysis: Why Sharapova Can Have No Complaint About Ban
Sharapova's racket provider HEAD has always maintained its support for her.
And its chairman Johan Eliasch said in a statement: "We believe, based on the facts and circumstances provided to us, that is a flawed decision. HEAD will continue to support Miss Sharapova."
Meldonium, which is commonly used to treat heart and angina problems, was added to the list of banned substances for players in 2016 - but Sharapova maintained she had been unaware the rules had changed.
The drug increases blood flow in the body and allows more oxygen to be carried to the muscles, improving exercise capacity.
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