Retired Tipperary athletics coach Jerry Lyons with a young Shane Long.
Shane Long arriving at Wembley Stadium.
The game kicks off at 16:30 and is live on Sky Sports 1.
Super sub Long scored a late goal against Liverpool at Anfield to set up the showpiece with José Mourinho's side.
Southampton team to face Manchester United: Forster, Cedric, Yoshida, Stephens, Bertrand, Romeu, Davis, Ward-Prowse, Tadic, Redmond, Gabbiadini. Subs: Hassen, Long, Rodriguez, Caceres, Boufal, Hojbjerg, McQueen.
Manchester United team to face Southampton: De Gea, Valencia, Bailly, Smalling, Rojo, Herrera, Pogba, Lingard, Mata, Martial, Ibrahimovic. Subs: Romero, Blind, Young, Carrick, Fellaini, Rooney, Rashford.
Manchester United are favourites at 4/5 with Paddy Power, with Southampton at 4/1 and a draw at 4/1. Long is 9/1 first goalscorer, 4/1 to score anytime, 10/1 for anytime assist, 9/1 last goalscorer and 150/1 to score a hat-trick.