The Zenit St Petersburg midfielder was in Turin as the transfer window slammed shut with no agreement between the two clubs.
Thierry Witsel admits his son was upset, but won't mope.
He told Gazzetta dello Sport: "I spoke with Axel and he told me he's logically disappointed even if he's okay.
"It will work out great. Sometimes, in football It doesn't always go well, in life things can happen."