Cristiano Ronaldo won't scare the league's best defenders like Virgil van Dijk and Romelu Lukaku will be the most important Premier League signing this summer.

That's according to talkSPORT presenter Simon Jordan, who was giving his opinion on one of the most hectic transfer windows in recent years.

Ronaldo and Lukaku have both returned to the Premier League

Ronaldo is already a United legend

England midfielder Jack Grealish broke the Premier League's transfer record this summer when he swapped Aston Villa for Manchester City for £100million, while Lukaku took second place on that list with his £97million move back to Chelsea from Inter Milan.

But despite those eye-watering fees, all-time footballing great Cristiano Ronaldo stole everyone's thunder on Friday when he completed a sensational return to Manchester United from Juventus after 12 years away.

But when former Crystal Palace chief Jordan was asked who will make the biggest difference, his answer was prompt and to the point.

"Lukaku," he said.

"Lukaku playing in a Chelsea side that I admire.

Lukaku scored his first goal for Chelsea in his second debut

"I'm not a huge fan of Chelsea, I'm a London club supporter and it's not Chelsea so I don't sit there in awe of Chelsea, but I admire [Thomas] Tuchel, I think he embodies everything that a manager should be.

"I think that his team is quite formidable and I think Lukaku being put in that side will score 30 plus goals this season."

Lukaku has already broken his scoring duck for Chelsea after failing to find the net in his first spell, but had a slightly subdued appearance at the weekend when matched up against Liverpool's van Dijk in a 1-1 draw at Anfield.

However, Jordan has singled out another signing who will struggle against the league's best defenders.

"In the big games I don't think Ronaldo's going to put the fear of god into Virgil van Dijk," Jordan said.

United fans can't wait to have Ronaldo back

"I don't think Ronaldo will put the fear of god into some of these central defenders.

"But he will probably put the fear of god into Crystal Palace or Wolverhampton Wanderers or Burnley or Brentford or Newcastle United."

Jordan then went on to compare England's Premier League to Italy's Serie A, while suggesting this may be the season Ole Gunnar Solskjaer wins his first trophy as Manchester United manager.

"If you've got big occasion players that are playing against proper centre backs we will see if Ronaldo is still able to turn the screw at a level that I question he'll be able to do," Jordan said.

"It's one thing playing in Italian football, which I know is very defensive minded and technical, but it isn't as physical and it isn't as fast.

"There's going to be a point where Ole Gunnar Solskjaer wins something, if you keep buying £150million worth of footballers you're going to win something somewhere along the line!"