Howard produced a heroic man-of-the-match performance against Belgium in the last 16 clash in Salvador on Tuesday but it could not prevent the USA from bowing out from the FIFA World Cup following a 2-1 defeat in extra time.
The 35-year-old keeper made 15 saves at the Itaipava Arena Fonte Nova - a World Cup record that eclipsed the 13 set by Peru's Ramon Quiroga in 1978.
"What happens going forward with the national team, I don't know," Howard told reporters.
"Everything's a bit raw at the moment. I don't think it's black and white to be honest.
"There's no doubt barring injury that I'll be fit and willing to keep going, but there's a lot more things that go into that decision than just my physical health, so it's something that in time I'll decide on."
"I would imagine at the moment the way things look, I think Brad Guzan," Howard said on the Dan Patrick Show.
"He's a top Premier League goalkeeper, a dear friend and his talent is incredible."
