Former England defender Pearce, who made 50 appearances for the Hammers in the autumn of his career, has joined Alan Irvine on the coaching staff under David Moyes who was appointed last week following the departure of Slaven Bilic.
The Irons are third from bottom in the Premier League and return to action with a trip to Watford on Sunday.
West Ham have several players away on international duty so Moyes will not get the chance to work with the whole first-team squad until later in the week.
Pearce, though, is convinced the talent is there to help pull the east London club away from danger.
“David (Moyes) is acutely aware – as we all are – of exactly where the club are at this moment in time,” Pearce said in an interview with the club’s official website.
“It’s not going to be easy, no one is expecting it to be because the stakes are very high in the Premier League, but I think with the staff here and the squad of players, we have a great chance.
“The main thing is to enhance the togetherness at the club. I have watched West Ham a lot from the outside because it’s one of my former clubs, I probably keep a closer eye on things.
“I’ve seen a lot of them this season – I covered the Tottenham game at Wembley and the Liverpool game last week – and it is clear that everyone needs galvanising.
“Confidence has been dented and that is part of the task, to get that back on track. We need to find that togetherness again and the players are the most powerful ones of all in showing that.”