Souness believes that the strength of the Blues' squad is second only to Manchester City's in the Premier League, but insists Thomas Tuchel's side need to sign a proven goal scorer to compete for the top honours.
After Chelsea's win at Crystal Palace, Souness stated: "When you look at the team that started for Chelsea today and look at the subs, I would put Chelsea as having the second strongest squad in the Premier League behind (Manchester) City.
"Other than having an out and out 25-30 goals a season man, Chelsea are pretty near the finished article. If they get that, they'll be very dangerous. If they can land one in the summer you never know.
"No one is talking about them for the guy at Dortmund, (Erling) Haaland. Would they have a go there?
"I'm sure the owner would have a go if he saw any encouragement this year that they could be the team to win the big trophies, his eyes are only on the league and the Champions League, Abramovich. I think he would go again (and spend big for Haaland)."