Sligo manager Cathal Corey expects that the remaining players from the county's shock defeat to London in 2013 will be looking to make amends when the sides meet again.
The Yeats County travel to McGovern Park in Ruislip hoping to avoid a second Connacht SFC quarter-final exit in succession at the hands of the Exiles (3.30pm throw-in).
Five years ago, London edged Sligo 1-12 to 0-14 and followed that up by beating Leitrim in the semis to reach their first ever Connacht final.
Corey wasn't involved with the team then but he is expecting veterans like Charlie Harrison and Ross Donovan to help guard against any complacency.
"Playing London in London will be a bit of pressure for the whole team," Corey told RTÉ Sport.
"Ross and Charlie, Neil Ewing, Niall Murphy, Pat Hughes, they were over the last time Sligo played London and lost the game so they know how much that hurts too. So you'd be hoping their experience would help us get over the line this time.
"They'll be going over there trying to set the record right. They'll not want to go twice and lose.
"I don't think they'll carry much baggage into it as such. I think they'll be maybe glad of the chance to go over and making amends for the last time.
"The likes of Charlie and Ross and them would let the boys know it's not a nice place to get beat.
"You're a long way from Sligo in London when you get beat. So you'd be hoping that bit of experience will help focus the players."
Despite the fact that London haven't won a Championship game since, Tyrone native Corey believes they should be considered favourites for the tie, having played all of their games in a satisfactory Division 4 campaign at home and being somewhat of an unknown quantity.
"You don't really know exactly what London have," he mused.
"They can have any player in Ireland that comes to choose to play in London. They have that pick.
"If we were playing Offaly or playing Longford or were playing Galway, you know who's going to be there, you've watched them. But we're still hearing names out of London and it's probably just that, you can't really go and watch them either.
"You're not sure what the pitch is going to be like. It's just the unknown. The Sligo fellas have done it before so maybe not as worried as me but just for me personally, it's just a lot of things that you're not sure about.
"I would personally see London as favourites, the fact that they've played all their matches over there on that pitch.
"We haven't ever been in this position, we have to get on a plane, we've players that have never played championship football, we've to travel over to London, they've 13 players that have all played county football for their counties in Ireland.
"They've a lot of experienced players now. It'll be tough, you know, definitely going to be tough."
Sligo survived in Division 3 of the Allianz Football League by the skin of their teeth, having used the opportunity to blood some of last year's U21 Connacht finalists in the wake of some high-profile retirements.
Victory over Derry on the final day ensured that Corey's men survived at the expense of the Oak Leaf county, who have dropped from Division 1 to Division 4 in four years.
"We set out just to stay there," reflected Corey on the League.
"I suppose with Mark Breheny and Brendan Egan going, you knew you'd lost your 6 and 11. So it was finding people to replace them.
"The division was tough with Armagh, Fermanagh and Longford, all tough sides. Nobody likes going to them. Westmeath is a good football side, Offaly has that tradition.
"Out of the seven games we managed to get a result in four of them by playing new players and taking in new players.
"The Derry game became more like a championship game than a league game. With ten minutes to go, Offaly were six points up and we were three points down. At that stage we're well in Division 4.
"For the fellas, especially the younger players, like Paddy O'Connor and Liam Gaughan to score two goals in that environment was really satisfactory. You see the young players developing and becoming leaders in that situation.
"From the Derry match we would take a bit of confidence that the players know when to play and we're hoping that will continue over in London."
Watch The Sunday Game preview show at 9.30pm on RTÉ2 and the RTÉ Player, with live coverage of London-Sligo and New York-Leitrim on RTÉ.ie, the News Now App and RTÉ Radio 1.
The RTÉ coverage will be officially launched on Sunday Sport at 2pm on RTÉ Radio 1.
