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The IAAF's worldwide commercial partner Dentsu has "full confidence" in the governing body's reform process amid the ongoing doping and corruption scandals that have rocked athletics.
Reports have indicated German sportswear manufacturer Adidas is to break its sponsorship deal with the IAAF.
Adidas, according to the BBC, is to end its association with the IAAF four years early, with the company said to feel the revelations surrounding athletics constitute a break of its agreement with the organisation.
Publicly Adidas has only confirmed it is in "close contact" with the IAAF regarding its reform process.
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Meanwhile, Canon says it will not look to terminate its deal with the IAAF, although the firm is undecided on a future relationship.
A statement regarding Dentsu's position read: "The IAAF and its worldwide commercial partner Dentsu Inc. are in close and regular contact on all commercial matters and as part of such communication Dentsu's Executive Officer Kiyoshi Nakamura has expressed that we have full confidence in the new leadership of the IAAF and the reform process being led by current IAAF President Sebastian Coe and the IAAF World Athletics Series remains an important property within Dentsu's global sports business portfolio.
"At the beginning of December 2015, Sebastian Coe visited Tokyo for a first meeting with Dentsu and several of the Official IAAF Partners which was extremely well received."