Graham Potter acknowledged that difficult decisions are part of management following Erik ten Hag's handling of Cristiano Ronaldo at Manchester United.
Ten Hag has forced Ronaldo to train away from the first team after the Portugal international took himself down the tunnel at Old Trafford before the end of United's 2-0 win against Tottenham on Wednesday.
Ronaldo will not be in the squad for United's trip to Chelsea on Saturday following his manager's statement after the Spurs game that he would "deal with" the player's behaviour.
"I can't really comment because I don't know the ins and outs but he's taken his stance, sometimes you have to do that. Then you need the club's support. From the outside, that's what's happened," Blues head coach Potter said at a press conference on Friday.
"It's difficult for me to comment... Part of the job is to take some decisions that are difficult, but that's normal."
Since losing their first two games, including an opening day defeat to Brighton and Hove Albion when Potter was still in charge of the Seagulls, United have lost just once in eight Premier League games (6-3 at Manchester City), winning six of them.
The victory against Spurs was arguably the Red Devils' best performance so far under Ten Hag since his arrival at the end of last season, and Potter believes they will only get better.
"I think they've done well," he said. "Obviously not had a great start from their perspective, but they've battled back and they're getting points and they're playing well, so it's going to be a tough game.
"They've changed a bit in how they build up I think. More longer balls, more direct, at the same time they still have the same quality, they've got the likes of [Marcus] Rashford, Antony, [Jadon] Sancho, Bruno Fernandes plays a key role for them.
"They just seem to have adapted to the competition, adapted to each other, probably learning more about each other. It's a normal process really... I'm pretty sure they'll get better and better as time goes on."
Chelsea are unbeaten in seven games in all competitions since Potter took over from Thomas Tuchel (five wins), but have suffered recent injury blows with the news that N'Golo Kante will be out for around four months, missing the World Cup, while Reece James faces a race against time to be in Qatar and will be absent for the next few weeks.
"You have to at least acknowledge the fact they're human beings that want to be involved in that type of competition," Potter added. "The reality is I haven't got anything to say that'll make it any better for them.
"You just have to focus on the things you can control, focus on your rehab day-to-day, things get better and then you just move forward."