Manchester City have agreed a business partnership deal with technology giants Silver Lake worth £390 million.
The Premier League champions announced the deal on Wednesday , as the US-based firm becomes the second major partner of City Football Group (CFG).
Silver Lake label themselves as the "global leader in technology investing", and also boast UFC, Motorola and Tesla among their portfolio.
The investment is equivalent to over 10% of City's post-investment value of £3.7 billion, and the Financial Times report the sale breaks the valuation record for a sports group.
In comparison, City's arch-rivals Man Utd are valued on the New York Stock Exchange at £2.1b, while they also move ahead of Real Madrid and Barcelona.
Just over 12 per cent of City's share equity is already owned by a Chinese consortium, with the remaining 77 per cent belonging to Sheikh Mansour.
City chairman Khaldoon El Mubarak said: "Silver Lake is a global leader in technology investing, and we are delighted by both the validation that their investment in CFG represents, and the opportunities for further growth that their partnership brings.
“We and Silver Lake share the strong belief in the opportunities being presented by the convergence of entertainment, sports and technology and the resulting ability for CFG to generate long-term growth and new revenue streams globally.”
As part of the agreement, Silver Lake's Managing Partner and Managing Director, Eghon Durban, will join the City board.
The funds from the investment are set to be used to "fund international business growth opportunities and develop further City Football Group technology and infrastructure assets."
City Football Group have expanded their own portfolio since taking over the Premier League club in 2013.
They have also acquired New York City FC in the US, Melbourne City FC in Australia, Yokohama F. Marinos in Japan, Club Atletico Torque in Uruguay, Girona in Spain, and Chinese side Sichuan Jiuniu FC.
In a separate recent interview with Sky Sports , Al Mubarak stated the City group would not be taking any of the investment out of the club, and it would be used for their "strategy for the future."
He also commented on the club's issues with Financial Fair Play regulations, after City were accused of circumventing the rules which has since led to a UEFA investigation.
"I think our position on this is very clear," Al Mubarak said. "And we've made it explicit over the last couple of months.
"And given that there is a process underway it's very important for me to respect that process.
"Therefore I think it's not appropriate for me to comment other than we're respecting the process and we're going through the steps."
The accusations relate to the release of leaked files by German publication Der Spiegel, which suggested that City had been inflating income from sponsors in order to bend FFP rules.
City have denied the allegations, while UEFA's panel of investigators recommended back in May that the club be banned from the Champions League for at least one season.
