"I wasn't playing [enough], first of all", Rooney said.
A lot of the attention in the build-up to Thursday's friendly has been around the decision to award Wayne Rooney the chance to wave farewell to the worldwide scene, and while England's record-goalscorer will take the armband at some point on the night, it will be Delph who leads his country for the first time.
The ex-Manchester United star will enter the pitch wearing the No10 shirt for a final time in the second half, where captain for the night Fabian Delph will hand him the armband. He is an outstanding player and outstanding person.
"I have stayed focused I have stayed dedicated and I have worked really hard".
'You don't give the England captaincy to someone unless they really have the attributes you think can carry it and he has those outstanding attributes.
Asked if he'll give Rooney the captaincy when he comes on, Delph joked: 'I probably won't get the armband again so probably not, no.
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"He was one of the big reasons we were successful (in the summer)".
Manchester City player Delph said: "When I first came into the England set-up, Wayne was captain".
After making history in becoming England's all time leading goalscorer on 8th September during a European Championship qualifier against Switzerland, Wayne Rooney was interviewed by the FA's official Youtube channel to select his favourite three England goals.
"It is going to be a huge night for Wayne and it is important we honour him for all of his achievements".
"Playing on the squad for this game and see some old teammates, see Gareth and the coaching staff, and then obviously to play at Wembley for the last time will be a great moment", Rooney said.
"Part of the game is to pay tribute to what he's done, and I think players always look at how they would like to be treated in that situation. Hopefully he has felt that warmth from all of us and I know the reaction of the supporters will be very special to him", added Southgate.