The 30-year-old has endured a tough few years after being frozen out by Pep Guardiola at parent club Manchester City, and over the summer he agreed to link up with West Ham on a season-long loan deal for 2017-18.
Hart was a regular starter for the Hammers until recently when Adrian took full advantage of his opportunity to replace Hart for the clash with City.
David Moyes opted to stick with Adrian for Saturday's victory over Chelsea and the Spaniard could get the nod again Wednesday's home meeting with Arsenal.
Pearce has revealed Hart is frustrated after being left out over the weekend but insists he will work hard to force his way back in as he looks to keep his World Cup hopes alive too.
"He is disappointed that he hasn't been playing," Pearce told Talksport.
"The nature of the game is if someone plays well they might keep the shirt. That is what has happened. If it is the goalkeeper we highlight it a lot more than an outfield player but Joe is acutely aware that he has to fight to get back in the team again and he will do that.
"He is a genuine boy and obviously he has got an eye on the international situation and he wants to go to a World Cup, and rightly so. He has given his all for England. He is a top quality professional that will roll his sleeves up and say 'I have got to get back in the team'."