If his second Everton debut earlier this week was anything to go by, Wayne Rooney will be a reinvigorated character in the upcoming season.

Thirteen years after swapping Goodison Park for Old Trafford, Rooney is back at Merseyside to give his career a second wind.

Last term saw the striker fall out of favour for both club and country but he marked his return to Everton with a stunning long-range goal in the Toffees' pre-season clash with Gor Mahia on Thursday.

Obviously, it is still too soon to judge how much of an impact the 31-year-old will have on Ronald Koeman's side but the early signs are promising.

Meanwhile, Romelu Lukaku, who headed in the opposite direction to Rooney has a very different challenge ahead of him.

Following years of developing his reputation as a prolific Premier League striker, Lukaku will now be expected to take another step up in his game to succeed at Man United.

Easier said than done, of course, but if there's one person who knows a thing or two about living up to the billing after a mega-money move, it's Rooney.

And Man United's record goalscorer has passed on some wise words of advice onto his striking successor at Old Trafford.

"Playing for Manchester United is a test of character, said Rooney, as per the Daily Mail.

"You've got to be strong enough mentally to accept the challenge. United are a football club that demands success. Romelu has to be strong enough to take up that challenge.

"If he does that then, with the ability he has got, then he will be a success. If he worries about things then it will be more difficult."

The £25 million fee United paid for Rooney in 2004 looks an absolute bargain in comparison the £75m required to bring Lukaku to the club.

The Belgian will certainly need to hit the ground running if he is to prove his doubters wrong.

And back when Rooney joined, he entered a dressing room filled with club legends who set the standard expected from every single player - a luxury Lukaku does not have at his disposal.

The new Everton signing admitted that influence helped his transition but he is eager to focus on his new challenge.

He added: "There are standards that you have to keep when you are at Manchester United. That came from Sir Alex when I went to United and it was passed down through the likes of Giggsy, Gary Neville and Scholesy.

"That has been more difficult over the last few years, with some of the players who joined the club. That's not my problem anymore. I'm just ecstatic to be back at Everton."