Detective Superintendent Pat Twiggs, head of crime for Leeds, said: "We can confirm that police are investigating an allegation of theft relating to Leeds United Football Club following a report made by the club made on April 9".
West Yorkshire Police would not confirm details of their inquiry but according to reports, officers were called to the ground on Wednesday after surveillance equipment was found in the boardroom and toilets.
A former Leeds United and US winger has used his blog to reveal that he is gay and announce that he is to retire from football aged just 25.
Robbie Rogers posted: "Secrets can cause so much internal damage. People love to preach about honesty, how honesty is so plain and simple.
"Try explaining to your loved ones after 25 years you are gay. Try convincing yourself that your creator has the most wonderful purpose for you even though you were taught differently."
He added: "I always thought I could hide this secret. Football was my escape, my purpose, my identity. Football hid my secret, gave me more joy than I could have ever imagined… I will always be thankful for my career.
"Now is my time to step away. It’s time to discover myself away from football."
A Dubai-based consortium has confirmed it is to take over control of Leeds United Football Club.
GFH Capital Ltd, which is a subsidiary of the Bahrain investment bank Gulf Finance House, has confirmed that it has signed an exclusive deal to acquire Leeds City Holdings, the parent company of Leeds United.
The deal was announced in a letter from GFH to the Bahrain Stock Exchange today.
Tonight's Capital One Cup third round tie between Leeds United and Everton is expected to go ahead as planned, despite heavy rain and flooding in the Yorkshire region.
A Leeds United statement said: "Leeds United can confirm that, as of 9.30am on Tuesday, there were no concerns ahead of the Capital One Cup third round tie with Everton at Elland Road (7.45pm) despite incessant rain.
"There is no pitch inspection planned, and should the situation alter, fans will be informed via www.leedsunited.com.
"Fans are reminded to arrive early ahead of the game to avoid congestion at both the Ticket Office and the turnstiles."