That International Cricket Council (ICC) suspension, for being in charge of an England team that was twice slow with its over-rate during the past 12 months, starts with Saturday's ODI series finale against New Zealand at Lord's.
But it was not England's sub-standard over-rate at The Oval on Wednesday, where New Zealand won a dramatic one-wicket victory off the last ball, that placed a question mark against Collingwood's captaincy.
The Durham all-rounder's failure to recall Grant Elliott, run-out after a collision with England quick Ryan Sidebottom, led to widespread criticism although Collingwood did admit after the match he'd made a mistake.
However, former England off-spinner Miller told Sky Sports he expected Collingwood would resume the captaincy of the one-day side when his ban expired. "I don't think there is any uncertainty whatsoever.
"We have to wait to see how things progress."
England play four Tests against South Africa, games for which the 32-year-old Collingwood remains eligible, before he is obliged to sit out August's one-off ODI against Scotland and the lone Twenty20 and first ODI with the Proteas.
"He (Collingwood) is a quality player, will be involved in the Test arena and will come back into the equation when we start talking about the one-dayers," Miller said.
"I see no reason why he shouldn't come back as captain but we will have to assess things when the time arises.
"Colly was captain of the one-day (team), he is not allowed to play in the next four so we will cross the bridge when we come to it. It is all ifs and buts. We will discuss that when the time comes."
Turning to the run-out contoversy, Miller said this would not be held against Collingwood.
"He had to make a split-second decision. He made a decision and in the cold light of day realised it might have been the wrong decision. He has accepted that and has apologised so hopefully that issue is now closed."
Kevin Pietersen, who will captain in Collingwood's absence at Lord's, in a match England must win to end the series level at 2-2, said Friday: "We should have helped the skipper out, there's no way Colly should have 'gone down'. It's all our fault."
But he added match referee Javagal Srinath, the former India fast bowler, had little choice but to impose a four-game ban.
"That's the rules, there's nothing Javagal could have done. We should have helped Colly out a lot more."