The England international, who has joined the Cherries on a season-long loan, played 76 minutes of football in the south coast club's 1-0 win over Everton on Saturday and is being backed to make a positive impact once he is fully match fit.
"He'll play 90 minutes the day that he deserves 90 minutes or he's able to play 90 minutes," Howe said.
"I just want to manage his workload so that he stays fit.
"I think that's really really important for him and I think he recognises that the most important thing isn't Jack, it's the team. And I have to make the decision that's best for the team at all times.
"It's not a big issue for me because obviously if he plays like he did against Everton he's going to have a massive impact on our season."