Wheeler, 23, missed just one game in his two regular seasons with the Bruins, scoring 39 goals and notching 44 assists in those 163 games. In 21 playoff games, he has one goal and five assists to go with a minus-6 rating.
"We're going to work hard to get something done," Wheeler's agent, Matt Keater, told the Globe.
Campbell, 26, came to the Bruins along with Nathan Horton in exchange for Dennis Wideman and draft picks in June. He has 85 points in 363 career games.