UK constabulary volition analyse claims Greek constabulary successful Athens utilized riot shields and teardrop state connected England supporters earlier the Nations League lucifer with Greece.
Officers from the United Kingdom Football Policing Unit (UKFPU) were astatine the crippled and "actively worked" with section authorities to assistance "influence a alteration of tactics".
The Football Supporters' Association (FSA) is asking fans to stock their experiences, external of the concern that unfolded extracurricular of the Athens Olympic Stadium connected Thursday.
Free Lions, the FSA's fans' embassy team, said determination is "still intelligibly truthful overmuch needed" to guarantee fans are not enactment successful "unjustifiably unsafe situations".
In a connection to BBC Sport, the UKFPU said: "A squad of officers from the UKFPU were contiguous astatine the lucifer successful Greece and we are alert of the difficulties that immoderate fans experienced erstwhile attempting to participate the stadium.
"Officers actively worked with their counterparts to power a alteration of tactics and, pursuing the match, an probe volition present instrumentality spot successful concern with the FA and FSA."
The Football Association said it is obtaining accusation to found what happened.
About 3,500 England supporters travelled to the Greek superior for the sold-out fixture but immoderate complained of being "pushed" and receiving "heavy-handed" attraction from section police.
The FSA said Uefa, European football's governing body, has besides been informed.
BBC Sport has contacted Uefa for comment.
One fan, Mark, wrote connected X, external the attraction was "completely unnecessary" but added "unfortunately you travel to expect it pursuing England".
Another idiosyncratic said, external section officers were "funnelling hundreds of fans (including children) into a fewer entrances" past became assertive erstwhile "there was a squeeze".
"Despite being told however things would run successful advance, to spot the nonstop other hap successful immoderate cases, and to spot the attraction of our fans by section constabulary utilizing shields and teardrop state to bash thing arsenic elemental arsenic rearrange a queue, is truthful incredibly frustrating," Free Lions wrote connected X.
"On a nighttime wherever we had a large effect connected the pitch, determination is inactive intelligibly truthful overmuch needed to bash disconnected it to guarantee our supporters aren’t enactment successful unjustifiably unsafe situations."