Newcastle United's pending sponsorship deal with Wonga has come under fire from local politicans - prompting one MP fan to threaten a boycott of the team.
The payday loans company was confirmed as the main shirt sponsor in a four-year agreement that also included the purchase of the stadium's naming rights.
Rather than naming the stadium to advertise their brand, the company said it had opted to revert to the stadium's original name in a move likely to be welcomed by fans who were furious when it was renamed the Sports Direct Arena in November 2011, in a temporary deal with club owner Mike Ashley's sportswear empire.
As well becoming the club's main commercial sponsor, Wonga will invest at least £1.5m in the club's Academy and the Newcastle United Foundation Enterprise Scheme, which sees 15-16 year olds given employment opportunities through training courses.
Derek Llambias, Managing Director of Newcastle United, said: "We are building a club that can regularly compete for top honours at the highest level.
"As everyone knows, a strong commercial programme is vital to this goal and I am delighted to welcome Wonga into the fold as our lead commercial partner, alongside Puma and Sports Direct.
"Throughout our discussions Wonga's desire to help us invest in our young playing talent, the local community and new fan initiatives really impressed us and stood them apart from other candidates."
Errol Damelin, founder and CEO of Wonga said: "We're really proud to be involved with Newcastle United.
"It is one of the biggest and most important clubs in the UK by any measure and has a fantastic following around the world. We're also really excited about investing in future stars both on and off the field."
But the move to make Wonga the club's shirt sponsor has been met with criticism.
Leader of Newcastle City Council Nick Forbes sent a letter to Newcastle owner Mike Ashley on Monday, warning of the "social consequences of the deal", and claiming it would be the "wrong image for Newcastle, NUFC, and football as a sport".
Mr Forbes said he feared the need for debt support in the city could now increase and that he would ask the club to help pay for it.
Wonga offers short-term loans at a rate which can potentially reach more than 4,000% APR.
Ian Lavery, MP for Wansbeck, is a season ticket holder at the club but has said he will now not set foot in the stadium.
He said: "A city like Newcastle and the region should not have any ties with an organisation like Wonga.
"This business makes profits off the back of deprived people who are desperate and who are the most vulnerable in society."
Chi Onwurah, MP for Newcastle Central, tweeted: "Some of the richest young men in Newcastle to wear shirts calling on the poorest to go to a legal loan shark."