During a game of table football at the skills centre in Harrow, Mr Cameron made a cheeky reference to Chelsea footballer Ashley Cole after it was confirmed the veteran left-back had been left out of England's World Cup squad.
"That was the Ashley Cole special," he quipped after the Mayor scored an own goal while in control of the blue team's defence.
England manager Roy Hodgson will this afternoon name his 23-man squad for the 2014 World Cup in Brazil, plus the seven players he wants on standby for the tournament in case of injury.
ITV News will stream the news conference live online as he makes the announcement at 2pm.
England and Chelsea defender Ashley Cole has tweeted his retirement from the national team, following reports that England manager Roy Hodgson would leave him out of his squad for the forthcoming World Cup.
Cole said the England team "should be about the young players", adding: "I think it best I retire from England team now."
Chelsea's Ashley Cole is set to win his 100th international cap after being named in England manager Roy Hodgson's squad to face Brazil on 6 February.
Captain Steven Gerrard describes him as "the most consistent player" he's come across in his career.
Chelsea defender Ashley Cole will win his 100th England cap when he starts tomorrow's friendly match against Brazil at Wembley. The England Manager Roy Hodgson has confirmed that Cole will be in his starting line-up.
Cole will become only the 7th English player to reach the milestone behind Peter Shilton (125), David Beckham (115), Bobby Moore (108), Bobby Charlton (106), Billy Wright (105) and Steven Gerrard (100). However, Hogdson confirmed that Cole would not captain the team.
Chelsea left-back Ashley Cole has been charged by the Football Association in relation to a Twitter comment which was "improper and/or brought the game into disrepute", the governing body has confirmed.
Chelsea manager Roberto Di Matteo has said the club will hold a "disciplinary process" after Ashley Cole insulted the FA in a tweet yesterday. Cole did apologise for making the comment.