West Ham United will face Manchester United in the FA Cup next week.
The defender says a lot of unlucky things happened to the Toffees on Sunday and believes his side did not play badly.
The former Black Cats loanee has backed the club's fans to help them battle to safety.
Borussia Dortmund and Liverpool will face each other in the Europa League this week.
Walker had given the away side the lead at Parkhead.
Leeds United are set to host Queens Park Rangers tomorrow evening.
The Swans find themselves 10 points clear of safety, after an impressive come-from-behind draw against Stoke City at the weekend.
Leicester City beat Southampton 1-0 at the King Power Stadium.
The ex-Stoke City man netted his first league goal since 2012 in Sunday night's 4-1 victory over the Portland Timbers.
Everton lost 1-0 to Manchester United at the weekend.