The Rangers boss admitted that no moves are imminent but he will continue to work to add to his squad before the transfer window closes.
And he says the calibre of player he is targeting is affected by the ambition to win promotion and to reward fans.
He said: "Plainly and simply we need to get out of the division by winning the league so you would hope with better players you'll have a better chance of doing that.
"Just as importantly I honestly believe that the support deserves the best that we can give them, within a financial budget.
"I've been incredibly encouraged by the signings and the stature of those signings because we have still managed to sign one or two internationals.
"I think I am duty bound to bring the highest calibre player I can to the club.
"I think the fact that we have 33,000 season tickets sold and will have over 45,000 at the game tomorrow means they deserve the best we can possibly give them.”
The Rangers boss has been casting his eye over a series of trialists throughout the week at Murray Park but says no moves are imminent.
Andre Moritz has now moved on to seek a move elsewhere, but McCoist watched a number of others in training this morning.
Those include French defender Sebastien Faure and Australian forward Francesco Stella, with the former performing well during training and closed door games.
McCoist said: "There's nothing imminent but obviously we'll continue right up to the close of the transfer window to try to bring in as many players as we require.
"Moritz is away now. We had a practice game on Wednesday that he didn't play in. We need to see people before we can sign them.
"It was his decision not to play, but that's fine, we accepted that and he'll look elsewhere now.
"Faure has shown up really well in training and we'd maybe be hopeful of getting a deal done there.
"Sebastien played in that game on Wednesday and came through that well so there is hopefully a deal to be done there.
"And Francesco Stella is an Australian lad that is in to have a look at the place and let us take a look at him.
"He played on Wednesday and he will stay here next week to train as well.
"We'll see four or five coming in for us to take a look at and them to take a look at us.”