Cahill said: "It’s hard to know if Chelsea will spend more money because I do think the squad looks good. I’ve always said they needed a proper 20-goal-a-season striker and I think Liam Delap fits the bill perfectly. He looks great business to me and I think he’ll do really well at Chelsea.
“Cole Palmer has been the top goalscorer the last two seasons, and we all know how talented he is, but he’s a midfielder at the end of the day. Chelsea need a striker scoring the majority of their goals if they want to go to the next level.
“A striker that scores 20-plus goals a season is worth, I can’t tell you how many league positions… and that’s why they are so hard to come by.
“They’ve managed to keep the core of the squad that did so well last season is still there and they’ve just sprinkled it with players in positions they needed cover in, like a centre forward.
“I know there’s been a lot of players coming and going through the door recently but I don’t think that should be seen as a negative for the players that are already there. When I was playing, new team-mates excited me because, nine times out of 10, that player is someone the club feels is going to make the team better and that can’t be a bad thing.
“There’s competition for places throughout the Premier League but, the higher up the division you go, the more competitive it gets. When I was at Chelsea we had five world-class international centre-backs all competing for two spots in the team.
“If it’s done in the right way, it can almost fizz the team up and give everyone a bit of a buzz. The transfer business so far this summer should do that.”