The FA and the Football Supporters' Association (FSA) are investigating reports that some England fans were tear gassed and allegedly subjected to violent treatment as they tried to get into the Olympic Stadium in Athens during Wednesday's Nations League match.

Some supporters have accused the Greek riot police of being unnecessarily heavy handed, as fans queued to get through the turnstiles.

Around 3,000 England fans had tickets for the game, but many were not inside the stadium by kick-off.

The FA said: "We are aware that some of our fans had a difficult experience outside the ground and are obtaining more information on exactly what happened."

The FSA said in a statement: "Unfortunately, once again, we are having to ask England supporters to send in their witness accounts to ourselves regarding the situation outside of the Athens Olympic Stadium.

"Despite being told how things would operate in advance, to see the exact opposite occur in some cases, and to see the treatment of our fans by local police using shields and tear gas to do something as simple as rearrange a queue, is so incredibly frustrating.

"We'll say more over the next 24 hours, but in the meantime, if fans can email [email protected] with your experiences, we will work with the FA and we will raise with @FansEurope and in turn @UEFA, who have already been made aware.

"On a night where we had a great result on the pitch, there is still clearly so much needed to do off it to ensure our supporters aren't put in unjustifiably dangerous situations. We keep trying. Safe travels home all and thanks in advance."