The funding ties in with the Football Association's five-year plan to improve grassroots facilities in England and reduce reliance on subsidies from struggling local authorities.
The FA will be working with London boroughs to create their own hub facilities in order to create and manage sports pitches in local communities. The idea is for a trust - consisting of representatives from the local borough, County FA and the Greater London Authority - to run the sports hubs, which would be self-sufficient with their own facilities and could host a mixture of school and community sessions during the day, youth coaching in the evening and weekends and recreational "pay as you play" sessions in the evening.
The hub trusts will then manage the ongoing development of new and existing all-weather 3G pitches for a wider community use across a number of sports.
Over the next four years the FA plans to create football hubs across up to 30 cities. The national hub facilities programme is being funded by the FA, Sport England and the Premier League, and will be delivered by the Football Foundation.
A London-wide process is due to be launched later in the spring for boroughs to bid for investment to kick-off their hub and football pitch improvement programme.
Johnson said: "There is no doubt we need more good quality sports pitches in London that can be used all year round and that is why I am investing to ensure the capital is at the front of the queue and reaps maximum benefit from the FA's programme.
"It makes absolute sense that the good folk who run local clubs and groups across the capital have the opportunity to have a greater say in the running of their own sports facilities and take the pressure off council budgets."