Miller was left out of the Rangers squad for the Scottish Premiership game against Hamilton Academical away from home before the two-week international break.
The 37-year-old striker subsequently played for the Gers’ youth team that weekend, but the former Celtic man is now back in the first-team fold at Ibrox.
Rangers manager Caixinha has made it clear that there is no problem between him and Miller.
The Portuguese boss, who replaced Mark Warburton at Ibrox last season, has also pointed out that it was his decision to give the former Wolverhampton Wanderers and Derby County striker a new contract.
Miller signed a new one-year contract extension in April to keep him at Rangers until the end of the 2017-18 campaign, as reported by BBC Sport.
Rangers finished third in the Scottish Premiership last season and will be aiming to end up at least second in the league during the 2017-18 campaign.
Caixinha told The Glasgow Evening Times about Miller: “I said it before the Hamilton match, I said it after the Hamilton match, I said it along the week, I am saying it now.
“Sometimes we used to say that a lie told a lot of times will become true. There is no issue. Period.
“He is one of ours. Who gave him the contract? I gave him the contract so that means I have trust and confidence in him. It is one question of decisions.”