The Hammers sit six points clear of the Premier League's bottom three thanks to a win and a draw in their last two games.
"We're definitely a really dangerous team," Hart told the club's website. "Marko is in absolutely fantastic form for us after a difficult start to his West Ham career, but since then he's been our standout player. I'm really pleased for him because he's a really good guy.
"Chicha (Hernandez) is just a top, top professional. He's a goalscorer. It's been different for him, especially with internationals and travelling the length and breadth of the world, so we weren't able to get him on the bench last weekend, but he's come off the bench this time around and got a goal he deserved.
"He's a top player. There is no fluke to his career or fluke to him winning all those medals. People don't get given medals – I know that for a fact and so does Chicha."
West Ham's Premier League run-in features games against Stoke City, Arsenal, Manchester City, Leicester City, Manchester United and Everton.