Redknapp is the favourite to take the England reins after Fabio Capello's resignation on Wednesday and Football Association chairman David Bernstein said on Thursday he would keep an open mind to candidates wanting to take the role alongside existing club commitments.
Hughes led Wales out against England and Poland after taking the Blackburn post in 2004 and warned it is a bit too much to ask of a manager.
"I used to change my opinion in that regard," the QPR manager said.
"Sometimes I felt it was possible to do both and then not. I did the role part-time and took charge of Wales for two games while a club manager, which I felt quite difficult.
"I think it would be a little bit unrealistic to be able to expect to do a high-level job and the national team. I think it is a little bit too much."
On who should be England's next manager, he added: "I am not particularly interested because I am Welsh, but I think it is clear to everybody that there is one candidate.
"It is clear in my mind and most other people's mind. I think they will go through the process and go through the possible charade of getting a shortlist and throwing a few names in the hat.
"But the bottom line is they will get the man they want in the end."
Hughes has enjoyed a distinguished club career since leaving his first managerial job with Wales, taking the helm at Blackburn, Manchester City and Fulham before joining QPR last month.
Most other international appointments come after sustained club success and Hughes has warned Redknapp it can be a frustrating job.
"The frustration of being a national team manager is that the players aren't yours," he said.
"They are with you for a short period of time and then immediately after games they go back to their clubs.
"Sometimes there is a frustration when you need to address things almost immediately after games and you haven't got that time frame to do that.
"There is a little bit of that frustration and sometimes you possibly have to negotiate with certain club managers to get your players available.
"It is not an easy job but if you get it right then certainly the England job is one of the best national jobs in world football.
"I am sure a lot of people will be putting their name in for the job, both English, British and foreign. We'll have to wait and see."
Hughes himself is available as low as 25/1 with the bookies to take the job, but he cooled any such speculation.
"I am that short am I? I don't think I will be getting a call, to be perfectly honest."
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