Rangers are still on course to sign Preston striker Joe Garner in a B#1.5million deal, but it is unlikely to be completed before Saturday's Ladbrokes Premiership clash with Motherwell.
And they have another option to complete their summer transfer business in Senderos. The 31-year-old former Arsenal defender is a free agent and has been training with the club this week.
"I can't speak highly enough of Philippe Senderos," Warburton said. "He hadn't been training with a team for a few weeks but his level of fitness is outstanding. His CV is well documented but his level of fitness and the way he has fitted into the group has been first class. He has dealt with training all week effortlessly.
"We have to look at a number of options and I've been very, very impressed by Philippe. Obviously he won't be involved at the weekend. He is going back to Geneva for a couple of days, but we are very pleased with what we have seen.
"But, again, we have to make sure we look at all our options and treat people the right way as well. Players want honest feedback and we will always do that to the players. That leaves us in good stead if we do it that way."
Meanwhile, Warburton has dismissed Motherwell boss Mark McGhee's assertion that his team should be closer to Rangers than Celtic because of the gap in levels of spending between the Glasgow clubs.
"It's a game of opinions," Warburton said. "That's the beauty of the game, that's why we love it so much. That's Mark's opinion, mine may differ slightly, but we will see after Saturday."
McGhee had said he believes his side have a better chance of getting something at Ibrox than they did at Celtic Park last week.
And they have another option to complete their summer transfer business in Senderos. The 31-year-old former Arsenal defender is a free agent and has been training with the club this week.
"I can't speak highly enough of Philippe Senderos," Warburton said. "He hadn't been training with a team for a few weeks but his level of fitness is outstanding. His CV is well documented but his level of fitness and the way he has fitted into the group has been first class. He has dealt with training all week effortlessly.
"We have to look at a number of options and I've been very, very impressed by Philippe. Obviously he won't be involved at the weekend. He is going back to Geneva for a couple of days, but we are very pleased with what we have seen.
"But, again, we have to make sure we look at all our options and treat people the right way as well. Players want honest feedback and we will always do that to the players. That leaves us in good stead if we do it that way."
Meanwhile, Warburton has dismissed Motherwell boss Mark McGhee's assertion that his team should be closer to Rangers than Celtic because of the gap in levels of spending between the Glasgow clubs.
"It's a game of opinions," Warburton said. "That's the beauty of the game, that's why we love it so much. That's Mark's opinion, mine may differ slightly, but we will see after Saturday."
McGhee had said he believes his side have a better chance of getting something at Ibrox than they did at Celtic Park last week.
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