All three have emerged as the best youth options within the club's setup.
Despite a disappointing Premier League season so far, fans are hopeful of the future with those three as part of the spine of the team.
"Yeah, they are amazing," Martinelli told Sky Sports.
"We have a very good relationship. Not just on the pitch, but off it as well.
"In the dressing room, we sit next to each other. We always talk and we're always having fun, which is nice for us."