"But when the chairman asked me to stand in, I was quite excited really.
"I see it as an opportunity over the next couple of weeks," he continued. "I'm not too sure I want it to go beyond the next two weeks.
"It will be a taster, so I'll be able to tell you whether I like it or whether I don't, or whether I want to go back to my own little world of doing what I want to do.
"But I see it short term and I'm sure the chairman sees it as short term. If we get two or three results, I'm sure the chairman may think differently."
Former England midfielder Barnes, who won 79 caps for his country, previously had an unsuccessful seven-month spell as manager of Celtic, which ended in February 2000, shortly after a humiliating Scottish Cup defeat by Inverness Caledonian Thistle.
He left his post as Jamaica boss in July to take up the manager's role at Prenton Park with ex-Liverpool team-mate Jason McAteer joining as his assistant.
The duo replaced previous boss Ronnie Moore following Tranmere's failure to make the League One play-offs last season.
Moore was recently appointed as manager of Rotherham for a second spell.
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