Samuele Dalla Bona has warned Chelsea owner Roman Abramovich that manager Antonio Conte will want more investment in the transfer market as the club's rivals strengthen ahead of the new season.
The Premier League champions have already failed in attempts to secure Romelu Lukaku from Everton after the striker chose Manchester United in a £75 million move.
The Blues have managed to snap up defender Antonio Rudiger from Roma, who joined from Roma in a £34m deal on Sunday.
Dalla Bona spent three years at Chelsea and he thinks that although Rudiger is a good signing, his old side need more players to keep Conte happy as they look to compete in the Champions League next season.
"They need to spend money for him to be successful next season and I think Roman Abramovich must get money out," Dalla Bona told Goal. "Otherwise they will find it too difficult to try to win the Champions League.
"Alex Sandro and Antonio Rudiger would be a great start to the transfer market. They are very strong but they will cost a lot of money. Sandro, in particular, played a great season with Juventus. They can both do it in England."
Chelsea are in negotiations for Juventus' Alex Sandro and AS Monaco's Tiemoue Bakayoko, while they are expected to look to Alvaro Morata and Andrea Belotti following their disappointment over losing out on Lukaku.
Dalla Bona now lives in Venice after his playing career came to an end after starting out at Chelsea. The 36-year-old had spells at AC Milan and Napoli after leaving Chelsea but he counts the Premier League as the best league in the world.
He continues to watch Chelsea and he admits that he is a huge Conte fan, after facing him on the pitch when he returned to Serie A.
"I watch Chelsea all the time. I make sure I have time free, I enjoy watching Conte. I was happy when they hired him," Dalla Bona added. "I knew he was a top manager and I was sure that he could do something important in England because he won here in Italy three times in three years.
"I was sure he would be very good for Chelsea. When you win the first time, it can be harder to win it a second time.
"He was also a fantastic player, for sure. I was in Bologna and he was in Juventus, he was already a coach on the pitch that day as we lost 1-0 to them at Bologna. We went into tackles, hard but fair. He was a very difficult player to play against."
Dalla Bona was considered a wonderkid as he made a move from Italy at 17 years old to Stamford Bridge. He trained alongside John Terry in the youth team before quickly getting his chance under Gianluca Vialli at only 18 years old against Feyenoord in the Champions League.
He was often picked ahead of Frank Lampard and his potential earned him a move to the legendary AC Milan side alongside fellow midfielders that included Andrea Pirlo, Gennaro Gattuso and Clarence Seedorf.
His chances were few and far between though, and after several loan moves and a move to Napoli, he retired at only 32 years old. Dalla Bona admits that he regretted leaving Chelsea but that his father Luigi's health problems were a huge factor in his decline.
"Gianfranco Zola, Marcel Desailly, Jimmy Floyd Hasselbaink, I loved playing with these players," Dalla Bona continued. "Maybe I made a mistake to go away but football is like this.
"I went to AC Milan but AC Milan was difficult and after everything on loan in Italy, I saw that the mentality is different, the football is different but now we will see what to do. Maybe if I stayed at Chelsea then maybe my career would be better.
"When I went to Italy, it declined. I have a big love for Chelsea still, I had a very nice time there. I then had a problem with my family at home which led to me retiring.
"My dad was dying while I had a contract with Napoli but I decided to get closer to him and I went to Mantova which was only two hours away from him. He then died and I had problems myself after my dad died as I had a very good relationship with him.
"After I played in Legia Pro (the third division) which was not the same as playing in Serie A, Premier League or even Serie B. It went like this, that’s life and that’s football. I hope to find a way back into football soon.
"People don’t always see it but when you are a footballer, you are also a human being. It should be okay to seek help, go to psychologists, therapists and things like this. Anything can happen in life, even when you are a footballer, for sure they should have more help with this.
"The footballers should also ask for more help, definitely. Sooner or later your career ends and you must find something to do after you finish or life gets difficult. It isn’t easy to find something new after playing for 20 years as a player.
"You miss the changing room, the jokes, you miss everything and then you start a new life but a new life is different to being a footballer."
Dalla Bona has done his Uefa B Licence in coaching and he is getting support from the prominent football agent, Giulio Tedeschi, to continue his career in the game. His most recent visit to Stamford Bridge was to attend the 4-0 victory over Manchester United back in October.