Former Chelsea manager Jose Mourinho has indicated that he needed more signings at Stamford Bridge after his side's struggles in defence of their Premier League title.
Mourinho steered the Blues to the championship after returning for a second spell in charge but left in December after a string of poor results that saw them slump close to the relegation zone.
The Portuguese -- who said he was not enjoying his time out of football -- has since been heavily linked with the Manchester United job.
And in an interview with Sky Sports, the 53-year-old explained the difficulties faced by managers who wanted to maintain title-winning sides.
"If you are in a club that wins, if you want to win again you have to create instability in the winners," he said.
"To do this, you have to make them doubt, you have to buy new players, you have to take them outside their comfort zone.
"If you win, there is a normal tendency to go to your comfort zone. If you don't react, if you believe that just because you won in one year that you are going to win again, it's very difficult."
Sources told ESPN FC this week that Mourinho was confident of taking over at United next season after talks were held.
Although current Old Trafford manager Louis van Gaal has rubbished the link, Mourinho has said he has a preference for the Premier League.
"I experimented with English, Italian and Spanish football, three of the top football sides in the world. I always say I need competition -- I need competition every week," he said.
"In Spain I was at an amazing club but I had four matches a year -- Barcelona v Real Madrid, Real Madrid v Barcelona -- and after that you win 4-0, 5-0, 5-1, 6-1."
He said that in England "you can win the leagues with 75 points, maybe less, so I needed competition."
Mourinho added that although he was out of work for the first time since 2007, "as a family, our home will still be England, our home will be in London. But obviously I am ready to move [if a new job comes up]."