Russell Martin has insisted the job is not done after a 2-0 win over Panathinaikos in the Champions League second qualifying round first leg at Ibrox.
Rangers will now head to Athens on Wednesday, July 30 to try and seal their place in the next round of the elite European competition.
But the Ibrox boss eased talks of taking a comfortable lead to Greece as he vowed his side must improve as he labelled the performance a "work in progress".
"Until the tie is done, I don't think we can be comfortable," said Martin on Premier Sports. "We have had a really good first half of the tie.
"Now we have to compete there and improve from this game and be better.
"I am confident we will be."
Discussing the victory and his first experience of a competitive match at Ibrox in the dugout, he added: "The aim of the game is to win and keep a clean sheet and to experience the atmosphere is great.
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"I thought the fans were amazing because I said before, it is not all going to be easy and there may be a few scary, bumpy moments and the fans stuck with the team incredibly well during those.
"I think we grew as the game went on, even before the sending off we were starting to grow and play with a bit more care and a bit more detail.
"There was lots to like, lots to work on. Very much a work in progress but for a start it was really good."
A Findlay Curtis effort followed by a Djeidi Gassama strike earned Rangers victory - and Martin was full of praise for the teenager after his impact.
"He was great," said the manager. "He started the game a bit nervous, as any 18-year-old fan would. But he grew into it and got better and better.
"He received too many balls in the first half with his back to their goal, facing his own goal. We gave him a bit of information at half time and he took it on so well.
"I'm delighted for him. It was an amazing finish."
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