The doping scandal which has blighted track and field may be about to land another blow on the IAAF after doubts were raised about the governing body's sponsorship deal with adidas.
A source has told ESPN that the sportswear giant, one of the IAAF's five official partners, is "looking into its options". A company spokeswoman confirmed that it is seeking further information about the athletics authority's reform process.
Elsewhere, the Press Association and BBC have claimed adidas is seeking to end its association with the IAAF four years early.
"As you know adidas has a clear anti-doping policy in place," the company spokeswoman said. "Therefore, we are in close contact with the IAAF to learn more about their reform process."
Doubts have been raised after two damning reports by the World Anti-Doping Agency's (WADA) independent commission which revealed "state-sponsored" doping in Russia and raised questions about widespread doping in other countries.
The IAAF said in a statement: "The IAAF is in close contact with all its sponsors and partners as we embark on our reform process."
The 11-year IAAF deal with adidas was signed in 2008 and was reported at the time to be worth $33million (£23m). The partnership made the company the product supplier for the governing body's official licensing range.
However, adidas has positioned itself as being firmly anti-doping. A deal with Tyson Gay was suspended in 2013 when he tested positive for a banned substance.
The Press Association contributed to this report.