England face Lithuania on Sunday in a World Cup qualifier
A knifeman brought terror to the heart of London on Wednesday afternoon, with four people, including an armed police officer and his attacker, killed.
England's friendly in Germany is due to go ahead as planned and, as the incident is still unfolding, the FA plans to mark the Westminster attacks on Sunday having spoken to relevant authorities.
"Our thoughts are with all of those who have been affected by this terrible incident," FA chairman Clarke said ahead of the match in Dortmund.
Chairman Greg Clarke on today's terror attack: "Our thoughts are with all of those who have been affected by this terrible incident."
— The FA (@FA) March 22, 2017
London Terror Attack: LIVE PICTURES
Wed, March 22, 2017
Two dead, 12 injured as knifeman mows into crowd in Westminster
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Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster, London
"We will be recognising the bravery of the security services and all those involved at the England v Lithuania match on Sunday."
England face Lithuania in a World Cup qualifier at Wembley on Sunday (5pm).
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Gareth Southgate said: "Obviously our first thoughts are with the families of those who have lost their lives or been injured. It puts football into perspective. We are conscious that part of our identity as a nation is that we carry on in moments like this.
"We have left everything else to our hierarchy. In terms of any tribute, we felt that in London on Sunday was the right thing to do."