The 27-year-old has yet to feature in the Premier League champions' pre-season preparations, first picking up a hamstring injury before being ruled out of United's most recent friendly with AIK due to a shoulder problem.
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“Obviously [Rooney's] not fully match fit but that's obvious,” Hodgson told reporters.
“[But it is] important to have him with us in the squad and assess how many minutes we can have from him.
“I spoke to David [Moyes] and he understands it's important to have him in the squad. It may not be ideal [lack of pre-season minutes] but it's very good that he can join us.
“When we meet up with him and speak with him I’ll make a judgement call on that. Last thing I want to do is play him for too long and run the risk of injury.”
Southampton frontman Rickie Lambert, who also celebrated the birth of his daughter on Thursday, earned a maiden call-up to the England national team, and Hodgson praised the 31-year-old's ascent up to the top flight of English football.
“This is a man who has come up the hard way, starting in non-league,” Hodgson continued.
“I first came across him at Bristol Rovers when I was at Fulham. If a man has worked hard to prove his worth over the years, he fully deserves his call-up.
“There are a couple of others, Daniel Sturridge and Andy Carroll, who might be ahead of him but are unavailable.”