The Gers won promotion back to the top-flight after finishing first in the Scottish Championship.
It has been a terrific campaign under Mark Warburton, with Rangers also winning the Petrofac Training Cup and defeated Old Firm rivals Celtic on the way to a place in the Scottish Cup final.
Many have already suggested that the Glasgow club can challenge Celtic for the title next season, yet Miler remains more realistic and tells reporters how his club must make some key additions this summer.
“There is no doubt we need signings because we are light in numbers and there are also situations that need to be resolved with the boys who are out of contract. We will need to sign players,” Miller told the HS.
"We have full faith in the manager, Davie, Jim and Frank and the work they have done so far. We have full belief and trust in them.”
Rangers have the basis of a strong team, yet a number of players are coming to the end of their contracts and the squad arguably needs more depth if they are to challenge next season.
Celtic won their fifth straight Premiership title last weekend, and many at Parkhead are suggesting the Bhoys are now targeting a record ten straight titles despite the return of their eternal rivals.
Miller, now 36, will be one of those to possibly step aside somewhat for new signings ahead of next season.