Chelsea boss Jose Mourinho says defender Branislav Ivanovic knows that he didn't enjoy a positive start to the season.
The 31-year-old came under heavy fire after a number of below-par performances but Mourinho says the two are always in touch to identify and fix mistakes in the Serbian's game.
"It's something I speak to Ivanovic about," Mourinho said.
"Ivanovic likes to speak with me, and he likes to speak with me about his mistakes.
"He is not crying. He is not a prima donna. I am critical with him. I speak with him about what he has to try to improve. I have no doubts he is my best right-back, and I have no doubts he has to improve some aspects of his game this season. It's as simple as that."
Radamel Falcao, Loic Remy and Oscar were not in the squad to face Porto on Tuesday night in the Champions League but the Portuguese revealed that the three trained very hard in London.
"I was told by my assistant that stayed in London and didn't travel to Porto, Chris Jones, that they worked fantastically well on Tuesday," he explained.
"They could have stayed here and not shown motivation, but because they knew they could be selected for the next match tomorrow they worked really hard and well on the Tuesday when it's not easy to do that because your team is playing and you're not travelling with the team.
"It's not easy to find that motivation, but they found it. In the last three days, normal business, working well like everybody else does here."