Rashford are on-loan at Barca from Manchester United, while Cancelo is on-loan from Al-Hilal. Both deals include pemanent options.
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Asked about the pair, Flick said on Saturday: "We need everyone until the end of the season. We do not know what happens afterwards because there is a World Cup too.
"I believe in my players - Rashford, Cancelo ... everyone. They add great quality to the team and that's good. Like the others.
"For me, at least it's not the time to say who I want. I need them all at the highest level. We talk together in the end and see what happens.
"Now it's not the time to say if I want one or the other. Everything can happen."