Arsene Wenger admits he had 'a lot of aggravations' with Jose Mourinho in his first stint at Chelsea

Former Arsenal manager Arsene Wenger has revealed that his rivalry with Jose Mourinho originally began back in 2004 when Chelsea started spending money 'they didn't earn'.

The long-serving Gunners boss had several clashes with Mourinho during the Portuguese's spells with both Chelsea and Manchester United in the Premier League.

Both Wenger and Mourinho made barbs at one another in the press, while the duo also clashed on the touchline on numerous occasions ever since Mourinho originally joined the Blues.

The 72-year-old Frenchman, who is currently serving as FIFA's Chief of Global Football Development, has opened up on how the heated rivalry began when the 'Special One' originally arrived in England.

It all started when Roman Abrahimovich took over Chelsea in 2003 before appointing Mourinho just a year later where they began spending big money in the transfer window.

The Blues signed Didier Drogba, Petr Cech, Arjen Robben, Ricardo Carvalho, Paulo Ferreira, Matej Kezman and many others that first summer, but that was just the start of the big-money spending.

The worse perhaps being when Mourinho's Chelsea snapped up Arsenal and England star Ashley Cole in 2006 after a long transfer saga over the player between the two clubs.

'My rivalry was more with the clubs than the persons, I never made any statements on a personal level,' Wenger told Sky Sports via Football Daily.

'I had a lot of aggravations with [José] Mourinho at the time because I felt that Chelsea were the first club that came in and spent money they didn't earn.'

Despite the rivalry going back to the beginning, the biggest bust-up between the two perhaps came in February 2014, when Mourinho taunted Wenger by calling him a 'specialist in failure' and later that year, they truly came to blows on the touchline.

Chelsea beat Arsenal 2-0 at Stamford Bridge in October 2014, a game that is best remembered for Wenger pushing Mourinho as they two clashed following a heavy challenge from Gary Cahill on Alexis Sanchez.

Mourinho responded to Wenger's push by flicking his tie.

Wenger also waxed lyrical about the 'turning point' for football including the Premier League being the introduction of Financial Fair Play.

Financial Fair Play was introduced in 2009 by UEFA as an attempt to curb excessive spending and to encourage clubs to pay out relative to what they earn

'At the time you had no Financial Fair Play, since that moment in 2004, nowadays they have created a financial fair play and there is more control over the finances of the clubs.

'Overall that was the turning point.'