Warne will travel by helicopter from London to Cardiff before handing over the ball in the centre circle.
Bristol Rovers got the FA Cup fifth round underway with an upset on Saturday when Rickie Lambert's late free kick gave the League One (third division) side a 1-0 win over Championship (second division) Southampton.
Middlesbrough were rewarded for beating Manchester City with a trip to FA Cup holders Arsenal while Chelsea's conquerors Bradford City host Sunderland or Fulham after the fifth round draw on Monday.
Everton were knocked out of the FA Cup 1-0 by third division Oldham Athletic in the third round.
Substitute Dirk Kuyt struck two minutes from time to give hosts Liverpool a 2-1 FA Cup fourth-round victory over Manchester United on Saturday with visiting captain Patrice Evra being booed throughout and making a mistake for the winner.
Premier League Swansea City fell victims to the first major giant-killing of the FA Cup third round on Sunday when they lost 3-2 away to League Two (fourth tier) side Oxford United.
Liverpool striker Andy Carroll headed an 87th minute winner to secure a 2-1 victory over Merseyside rivals Everton in an error-strewn FA Cup semi-final at Wembley Stadium on Saturday.
Liverpool thrashed third division Luton Town 5-0 in an FA Cup third-round replay with Steven Gerrard grabbing a hat-trick.
Spaniard Herrera finished off a fine move with a precise header from Pogba's cross just past the half-hour and United's French midfielder scored himself when he nodded powerfully home from a Marcus Rashford delivery before the break.
Liverpool drew 1-1 at third division Luton Town and Newcastle United were goalless at Stoke City in the FA Cup fourth round.
Liverpool's Charlie Adam will miss the FA Cup final against Chelsea on May 5 after having his season cut short by a knee injury, manager Kenny Dalglish said on Thursday.
A 68th-minute penalty by Cristiano Ronaldo secured a 2-2 draw at Middlesbrough in their FA Cup quarter-final.
Manchester United beat Reading 3-2 in an enthralling FA Cup fifth-round and earn a place in the quarter-finals.
Fernando Torres scored his first goal since October to help Chelsea crush Leicester City 5-2 and Liverpool beat Stoke City 2-1 to reach the FA Cup semi-finals on Sunday.
A club of Manchester United's stature should be vying for silverware on all fronts, midfielder Ander Herrera said, adding that a win in the FA Cup final against Crystal Palace on Saturday would raise spirits after a poor season. Louis van Gaal's men, who finished fifth in the Premier League this campaign, failed to qualify for the Champions League for a second time in three seasons and hope to win their first trophy since taking home the Community Shield in 2013. "We have to be realistic. United should be fighting for every title. We didn't do that with the Champions League," Herrera told British media. "We didn't do that with the Premier League. So we have two options. Firstly, feel sorry for ourselves. Or, secondly, get this trophy for the fans, for our club and for ourselves."
Arsenal striker Lukas Podolski scored twice in the opening half-hour as the Premier League leaders romped to a 4-0 win over third-tier Coventry City in their FA Cup fourth round tie at the Emirates on Friday.
Manchester United reached the FA Cup fifth round and avoided any further embarrassment.
Arsenal recovered from going two goals down in the opening eight minutes to beat Hull City 3-2 after extra time in the FA Cup final and win their first trophy for nine years at Wembley on Saturday.
Chelsea gave departing coach Guus Hiddink the perfect leaving present when they came from behind to beat Everton 2-1 in the FA Cup final at Wembley on Saturday.
Cesc Fabregas came off the bench to score a last-minute penalty to earn 10-times winners Arsenal a 1-1 home draw with Championship (second division) side Leeds United in a pulsating FA Cup third-round match on Saturday.
Left-back Saka and striker Eddie Nketiah netted inside 26 minutes as Arsenal's much-changed lineup made a dominant start
English third-tier club Sheffield United kept alive their FA Cup dream on Sunday when two goals in as many minutes gave them a 2-0 victory over Charlton Athletic and a place in the semi-finals.
Liverpool beat West Ham United 3-1 on penalties after the teams were level at 3-3 after extra time in the FA Cup final.
Second-tier Reading booked an FA Cup semi-final meeting with holders Arsenal.
Manchester City survived some jitters to beat Championship (second division) Leicester City 4-2 in a lively FA Cup third round replay at Eastlands on Tuesday.
Minor league Eastleigh suffered FA Cup heartbreak when they conceded a late equaliser to four-times winners Bolton Wanderers on a gluepot pitch at their snug Ten Acres ground on Saturday.
Neither the weather nor the anti-climax of the ceremony taking place the day after the FA Cup final defeat by arch-rivals Manchester United 2-1 could dampen the spirits as flags, bananas and even a blow-up Jack Grealish dummy were held aloft in triumph.
Manchester United manager Louis van Gaal goes into the FA Cup final against Crystal Palace on Saturday facing echoes of the 1990 showpiece between the two sides that proved so pivotal in the career of Alex Ferguson.
Bert Trautmann, a former German Prisoner of War who became a footballer in England and famously broke his neck playing in goal for Manchester City in the 1956 FA Cup final, died on Friday at the age of 89.
Tottenham Hotspur stormed back from 2-0 down to beat Burnley 4-2 in their FA Cup third-round replay on Wednesday despite resting their top striker in the once-fabled competition.
Eleven people were arrested in the Millwall supporters' section of Wembley Stadium on Saturday and four police officers suffered minor injuries after violence marred the London club's FA Cup semi-final defeat by Wigan Athletic.
Leandro Trossard transformed the mood at Arsenal with the winning goal as they recovered from an early setback to beat Tottenham Hotspur 2-1 at home.
The Premier League's two best teams and two most prolific strikers go head to head in the FA Cup on Saturday when Manchester United take on Arsenal in a huge fifth-round tie at Old Trafford (1715 GMT).
Arsene Wenger was hoping to get a better idea from a scan which Henry was having on a groin injury.
The Arsenal manager is not sure whether the injured striker will be fit for next month's FA Cup final against Manchester United.
Arsenal joined Manchester United and Liverpool on the FA Cup scrapheap on Sunday when Ricardo Fuller's double helped Stoke City to a 3-1 fourth round victory at the Britannia Stadium.
FA Cup holders Chelsea booked their place in the fifth round with a comfortable 2-0 victory over Championship (second division) side Preston North End on Saturday.
Bookies have placed Premier League leaders Chelsea as the new clear favourites with 3-1 odds to retain the FA Cup following Sunday's fourth-round draw.