The Portuguese forward's second spell at Old Trafford ended in a high-profile break-up in November 2022 after he made a variety of eye-catching comments in an interview.
That included criticising ten Hag and now the 39-year-old has hit out at his former boss again, saying a United manager cannot admit the club are a long way away from winning the Premier League and Champions League.
But the Dutchman remains unmoved by the superstar's latest remarks and pointed out that the Al-Nassr star himself had conceded himself on the Rio Ferdinand Presents podcast that it "will be difficult" for the Red Devils to challenge.
"He said that Manchester United can't win the Premier League," ten Hag noted on Thursday. "He said this, if you read the article very well.
"So, he's far away in Saudi, far from Manchester. Everyone is entitled to have an opinion. It's OK."
Ronaldo's interview has added to the noise surrounding ten Hag and his team during an international break that followed a 3-0 home humbling by rivals Liverpool, which was itself preceded by a late 2-1 loss at Brighton.
United head to promoted Southampton on Saturday lunchtime looking to avoid suffering three successive Premier League defeats for the first time since December 2015.
The 20-time English champions have not lost three of their opening four games since 1986-87.
"We will see where we are in May next year," ten Hag said. "It's very early in the season and it's about winning trophies, to be as high as possible in the league and do everything to win every game.
"Then we will see in May where we are and then judge."
Asked how the noise around United affects him, ten Hag said: "It doesn't impact me. I know in the process where we are, what we have to do, where we are going.
"I have said before we are still in a transition period. We have to integrate a lot of young players also in the team.
"We are still dealing with injuries, we have to bring the injured players back in the team.
"Before anyone thinks about excuses, no, we have to win every game.
"I know that, the team knows this and it doesn't matter who is available. We will focus on every game and have in every game the mindset that we have to win."
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