Chelsea fans reportedly had teargas fired at them by French police before and after the 1-1 draw with Paris Saint-Germain last night.
A report in the Daily Mail claims that a section of the travelling support had teargas fired them and were 'kettled' outside a bar in the city centre.
With 10 minutes played more than 200 fans were still trying to get into the Parc des Princes.
French police reportedly used the crowd deterrent amid scuffles involving the two sets of supporters.
The club have condemned the behaviour and stated that those involved will be banned.
Uefa is aware of the video but said they are unable to take any action as the incident took place away from the stadium.
"Uefa condemns all forms of discrimination and we are appalled by the incident which took place in the Paris Metro on Tuesday," read a statement. "However, as it occurred away from stadium, it is outside Uefa’s remit to act. It's a matter for local authorities to investigate further."
Chelsea battled to a 1-1 draw in Paris after right-back Branislav Ivanovic gave them the lead, and a vital away goall, in the first-half.
After the break, however, PSG were the much better side, with Edinson Cavani heading home an equaliser 10 minutes after the break. Laurent Blanc's side continued to push for a winner, but couldn't find a way past the reinstated Thibaut Courtois.
Jose Mourinho's team managed to hold on and now hold the advantage heading into the second leg at Stamford Bridge on 11 March.
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