Chelsea legend Frank Lampard blasted their market work and the sale of Nemanja Matic after the Community Shield defeat to Arsenal on Sunday.
Lampard, starting his new role as a BT Sport pundit, believes the loss to Arsenal shows "there's something not quite right there".
The former England midfielder, 39, said: "I'm sure (Antonio) Conte can go to the board and say he needs more players.
"They need another central midfielder, and they need cover in the wing-back roles.
"You look at the two teams there, and Chelsea have got almost half of what the Arsenal squad is.
"If we're talking about quality, I still think Chelsea have that quality, but when Conte was at Juventus he used to do the same thing in the summer. He used to push the club to buy more players to move forward."
On Matic's move to Manchester United, Lampard added: "It was a strange one [to see Matic join United]. He was such a huge part of Chelsea's play last year alongside Kante at the base.
"He let the wing-backs fly on and he allowed Pedro and Willian freedom to go forward."
Source: tribalfootball.com