Gary Cahill says Chelsea's players are in the dark over Antonio Conte's future, but insists the squad remain behind their head coach.
In the lead-up to the game, Conte's future has been questioned once again amid rumours Chelsea are lining up a replacement as they expect the 47-year-old to leave in the summer.
Cahill is unaware of any talks between Conte and the club's director, but thinks that the performance against Newcastle shows that the Italian can still motivate the squad.
"Of course we are [100 per cent behind him]," Cahill said at Stamford Bridge. "There is nothing between the manager and players, whatsoever. We continue to work hard. If you look at the league, if Manchester City hadn't done what they've done, the title would still be there to be won.
"For them to be in the position they're in this season, they've broken Premier League records. It shows how good they've done. If they hadn't done as well as that - I know it sounds obvious - we would still be in with a chance of the title.
"This season they've been fantastic, but we still aim to fight for second place. We have a big month coming up in February, let's hope we come out at the end of that month in a positive way.
"It is between the manager and the board. We have no idea about that, we have no idea what's going on between the lines. We just continue to work and give what we can for him and give what we can for our team-mates. That's the way we have to be.
"I have experienced it a lot in my time here, but this has been a successful period. Chelsea is a successful football club and he is a top manager. We can't have any impact. We just sit and we work and try to produce what he asks of us. He is very experienced and, more often than not, we get results."
Meanwhile, English football's busy schedule in January is played against the backdrop of the winter transfer window.
January signing Ross Barkley made his home debut on Sunday but Chelsea are still trying to add two more players before Wednesday's deadline day, with negotiations ongoing for Roma duo Edin Dzeko and Emerson Palmieri. Cahill admits that the squad could do with a little help after growing tired from playing nine games in 28 days this month.
"Let's see. The last couple of months have been demanding to say the least. In terms of the fixture pile-up I wonder if it has been worse than before," Cahill added. "I don't know if it is, but it feels very heavy.
"As players we can't impact that [the transfer window], it's nothing to do with us. We go out there to try and do the best we can, to win games and to win competitions. Other people make decisions and hopefully they make the right ones. Let's wait and see if anyone comes in.
"I feel okay. February is a huge, massive month for us with the fixtures coming up. However heavy it is, we are not going to be able to change the fixtures. We just need to find the opportunity to rest, take that chance and be as fresh as we possibly can.
"I'd love to feel how some of the other leagues do right now after having a two-week winter break, see what that feels like. Aside from that, we just continue. The manager has tried to rotate to keep people fresh.
"But he can only make so many because of the number of personnel in the squad and the importance of every game coming up. Yes, you get through it on adrenaline and on heart as well. When you're feeling fatigued, you work even harder if that makes sense.
"It is what it is. I'm not complaining about it, I have done it for years and years. We will just get on with it. Everyone is in the same boat in this Premier League. Going back to the FA Cup, we went out of the semi-final of the Carabao Cup which was disappointing, and so this is really crucial to us now.
"We are delighted to progress. I thought the performance was good, some of the individual performances were good and it was good to see some of the young boys get on as well."
Chelsea's three goals at the weekend came from a Marcos Alonso free-kick, while Michy Batshuayi scored the other two after earning yet another start with Alvaro Morata out with a back injury.
Batshuayi is expected to leave on loan should Chelsea get a striker into the squad but Cahill was impressed with his team-mate's performance.
"He [Batshuayi] got a start and he took his opportunity so I am delighted for him," he continued. "He works very hard in training. I was delighted that he got two goals because we started slowly in the first 10-15 minutes, but we got the breakthrough and settled down after that.
"I thought we took control. The opening goal was good timing."