Petrov was taken to hospital, where an X-ray revealed ankle damage. He will be sidelined for around three weeks.
Hopefully Stan will be fit for the Scottish Cup Final on May 22nd.
Meanwhile, the other Stan, Stanislav Varga, netted for Slovakia.
Scotland were beaten 1-0 by Denmark, while Liam Miller featured in a dull 0-0 draw for Ireland in Poland.
Johan Mjallby played for Sweden against Portugal alongside Magnus Hedman.