The Republic of Ireland international is pleased that his performances are attracting attention but insists that he remains focused on featuring for Everton
The 23-year-old, who arrived at Goodison Park from Wigan Athletic for a fee of £13 million (€16m) last season, is a reported target for the Red Devils with Louis van Gaal said to be an admirer.
"If a club like Manchester United are interested, obviously you are doing a good job," McCarthy told the London Evening Standard. "We will see what happens."
McCarthy was a mainstay in Roberto Martinez's side as they finished fifth in the Premier League ahead of Tottenham Hotspur and Manchester United, playing 34 league games.
While the Blues narrowly missed out on qualification for the Champions League, the Republic of Ireland international nevertheless views getting into the Europa League as "a massive achievement" and is looking forward to the new campaign.
"You would like to get into the Champions League but, thankfully, we’ve got the Europa League," said McCarthy. "A lot of people say the Europa League is not such a big thing but it was a massive achievement for each and everyone of us at the club. It will be tough but we will give it everything.
"Obviously, it will be a long season with the Europa League and I am sure the gaffer will bring in rotation.
"To be honest, I’m looking forward to getting into the season and getting going again. It is a big season ahead."
With two pre-season friendlies already under his belt for Everton, McCarthy is looking forward to returning to competitive action and says that the aim is to improve on last season's finish in order to qualify for the Champions League.
"We are no different from any other club. Our main aim is to get into the Champions League," declared McCarthy. "We want to improve on last season and push on even further."
Meanwhile, McCarthy also has one eye firmly set on qualifying for Euro 2016 with the Republic of Ireland, with the qualifying campaign kicking off in September against Georgia.
Martin O'Neill's team will also come up against Scotland, Poland and Gibraltar in Group D, as well as taking on the recently crowned 2014 World Cup winners, Germany.
After missing out on a place in the World Cup in Brazil, Glasgow-born McCarthy is determined to achieve "big things" with the Boys in Green.
"Not qualifying for the World Cup was a big disappointment but now we’ve got this opportunity and, hopefully, we can achieve big things with the Euros," he said.
"When we meet up in camp and get together, we will get everybody focused on the goals that we want to achieve. You want to qualify for big tournaments."