The Hammers have earned just one point under their new manager and are sat just one off the bottom of the Premier League, but there was reason for optimism after an improved performance against Manchester City last Sunday.
Their fixture run does not get any easier however, with the champions looming this weekend before Arsenal come to the London Stadium on Wednesday.
But having missed his side's last five games after returning from November's international break with a hamstring injury, Hernandez is ready to return against a side he enjoys playing against, having scored eight goals in 13 appearances against the Blues for Manchester United.
Andy Carroll, who has not played since the 1-1 draw with Leicester City, is also back in contention.
"We're looking much better," Moyes said. "We have had a whole host of players back training for a few days, not fully training and in some cases I would say not fully fit either, but it's good to get them back. Chicharito is one of those who is back in training.
"It's early days so I don't want to get carried away [and say this is a David Moyes team] just yet, but I have to say the players have been really good. They've tried to take on board what we've asked of them and they're doing the work.
"I've said right from the start that they have to do the work if they want to play and hopefully they're all doing that and things will improve. We're also getting a few players back from injury as well."
Moyes has a big decision to make as to who guards the net on Saturday. Hart was ineligible against parent club Manchester City last time out with Adrian producing a superb performance in his absence. Reports have suggested the England international is set to be dropped for the visit of Antonio Conte's side, although the Hammers boss was giving nothing away ahead of kick-off.
"Well, I wouldn't give the team out because I'm not here to help Chelsea, so I'll keep my team until tomorrow. I've got my decision in my own mind but I'll wait until tomorrow to announce it.
"I would always try to speak to the players. There are some occasions when you should speak to the players and others when you don't need to."