UEFA today confirmed they are to investigate the volatile scenes during England's victory over Turkey in Sunderland - incidents which will also prompt the Football Association to raise concerns about the venue for October's return match.
UEFA will study evidence around two pitch invasions, 12 arrests inside the Stadium of Light and scuffles involving Turkish players, with a decision expected on May 1.
There were also more than 80 arrests outside the ground and all these factors have led to heightened concerns about the final game of the European Championship qualifying Group Seven, which is expected to be played in Istanbul.
One leading Turkish FA official has already called for England to be punished by being forced to play their next match in a neutral venue but UEFA have played down such a possibility. Instead, a heavy fine is more likely.
UEFA communications director Mike Lee said: "UEFA have the reports from the referee, where the referee has made mention of the incursions on to the pitch. We are still awaiting the report of the match delegate but a disciplinary investigation will now be opened to consider the events of the game."
European football's governing body has played down suggestions that England could be forced to play their next game behind closed doors, and a heavy fine is more likely. The penalty could be more severe if there was evidence of racist abuse inside the ground but most chanting - xenophobic rather than racist - took place outside the stadium.
FA acting chief executive David Davies confirmed they would consider banning England fans from travelling to Turkey for the match, which is expected to be held in Galatasaray's notorious Ali Sami Yen stadium though the venue has yet to be confirmed by the Turkish FA.
If that stadium is officially confirmed then the FA may ask the Turkish FA for a change of venue to another stadium or city. The final option would be to appeal to UEFA for a change of country - though the last option would be unprecedented.
Davies said: "It is a matter of public record that we proposed that neither of our games with Turkey should be the last in the Group. As we couldn't agree on the dates for the fixtures, we drew lots and it turned out that we were drawn away to Turkey in the final game."
There is a history of tense relations between English and Turkish fans which culminated in two Leeds fans being stabbed to death in Istanbul three years ago. That alone could prompt a change of venue to a less volatile city such as Izmir, which has hosted England's last three games in Turkey.
Both England goals led to invasions by around 50 supporters and the second led to a scuffle with a fan involving Turkey's defender Alpay.
Selami Ozdemir, a board member of the Turkish FA, said afterwards: "England should not be allowed to play their next match against Slovakia at home. There were a hundred people on the pitch after England scored their goals.
"If this had happened in Turkey we would receive a two or three game home ban. England must be punished by not playing the Slovakia game at home."
There was a minor fracas involving players and team officials inside the tunnel. Gareth Southgate described the incident as "some pushing and banter", adding: "'Wait until you come to Turkey,' was the shout, with fingers being passed across throats. And that was just the kit man!"
Paul Barber, FA marketing and communications director, described the behaviour of the fans who invaded the pitch as "unwise, unnecessary and totally unacceptable" but praised Sunderland for their organisation.
He added: "Player and spectator safety is paramount at all times and we fully support the police in the actions they took to ensure that people stayed in their seats. We cannot tolerate fans invading the pitch and we expect those arrested to be dealt with by the courts.
"We are concerned about instances of racist chanting which have been reported to the police and we strongly condemn such behaviour by any fans."
PA