Brighton will wear the club's yellow and blue third kit on Saturday as a show of solidarity with Ukraine following the Russian invasion.
The Seagulls will also donate all profit from future sales of the strip - which is the same colours as the Ukrainian flag - to the British Red Cross Ukraine Crisis Appeal.
Albion's men's team were due to sport a turquoise change kit for their Premier League game at Newcastle, while the women's side would have worn the club's blue and white home strip for their WSL trip to Aston Villa.
Brighton chief executive Paul Barber told his club's website: 'Like so many across the world, everyone at our club is horrified by the invasion of Ukraine, and we add our voice to the many calls for peace.
'We also want to show our full support for the people of Ukraine, and to all those who are suffering innocently from this terrible conflict, not least the many children.
'As a club, and on behalf of our players, staff and supporters, we would also like to recognise and show our respect for the many humanitarian efforts to alleviate the suffering in the region.'
Southampton manager Ralph Hasenhuttl said they were unable to change their plans for Wednesday's FA Cup tie against West Ham but they would definitely wear their yellow and blue kit against Aston Villa on Saturday, a pre-planned move which is being turned into a show of solidarity.
He said: 'I just spoke about that with my club, but it is not always possible because of some other things you have to be aware of, if it fits to the opponent.
'We will play with yellow and blue against (Aston) Villa at the weekend, that is for sure.'
National League North side Darlington will wear their yellow and blue third kit in support of Ukraine for Saturday's home match against Blyth.
A collection will also held with the proceeds donated to a refugee charity.