Rangers boss Walter Smith admits the win over Inverness has provided a huge psychological boost as his side bid to return to the top of the SPL.
Steven Davis grabbed the only goal of the game as the champions moved to within two points of leaders Celtic, with two games in hand over their rivals.
Rangers could move into pole position before Celtic's next game by beating Hearts in Saturday's early kick-off; the Hoops take on Aberdeen later in the day.
Smith said: "We've got games in hand that we have to win and it makes the games we play in midweek important ones for us. That was why this game was really important psychologically. We've closed the gap."
However, Kenny Miller (pictured) may have played his last game for Rangers after agreeing personal terms with Turkish champions Bursaspor, having rejected a move to Birmingham.
He was absent from last night's squad and Smith said: "Kenny and his advisers have agreed their part with Bursaspor. We'll just have to wait and see if they can reach agreement with our own club."
Inverness boss Terry Butcher was livid that his side had to make the long journey to Glasgow at short notice for the rearranged midweek fixture, and hit out at the SPL's plans to revamp the top-flight league structure.
He said: "We've travelled a few hundred miles this week, Rangers haven't, and we are angry about being forced to play. We are disappointed that we're being bullied into submitting to this 10-team league, which we feel is wrong. We are on the edge of a precipice and we don't want to be pushed over. At this moment, we feel like we are."