At least two "major" shops will demand publishers remove Steam functionality from PC games, a new report claims.
If publishers refuse, those retailers will not sell PC games with Steam integration at all.
"Key retailers" fear Valve's digital service has a "monopoly" on the download market, according to MCV.
Sources claimed Steam serves 80 per cent of the PC download sector, and shops are worried that selling games with Steam tech built-in pushes users towards only buying games through Valve.
"If we have a digital service, then I don't want to start selling a rival in-store," the digital boss at one of the biggest UK games retailers told MCV.
"Publishers are creating a monster we are telling suppliers to stop using Steam in their games."
More than 30 million people have Steam accounts, according to Valve.