Fraser was appointed managing director of cricket at Middlesex in 2008
Middlesex managing director of cricket Angus Fraser says he is not planning to make dramatic changes to his squad following promotion to Division One.
The county will play in the top flight for the first time since 2006 after winning the Division Two title.
"These players have worked hard over the past two or three years with the aim being to play in the first division," Fraser told BBC London 94.9.
"To get there and for that opportunity to be taken away would be wrong."
Fraser added: "Cricket is not like football in the way that you suddenly get tens of millions of pounds to go and buy new players, and I wouldn't do that anyway.
"These cricketers deserve the chance to see how they fare at this level of cricket."
Middlesex have signed Kent batsman Joe Denly for next summer and Fraser is hoping to complete a deal for Sussex all-rounder Ollie Rayner, who spent two spells on loan with the county last season.
"I would expect some good news to come on that front in the next few days," said Fraser.
Otherwise former Middlesex and England paceman Fraser is satisfied with his squad and feels they are capable of being a force in the first division.
"People might say that first in the second division is only the 10th best in the country," he added.
"I would disagree with that. I would like to have thought that the quality of cricket we played this year would make us a very, very competitive side.
"I don't think we go into the first division over-awed by what's ahead of us. We go there believing that if we play to similar standards then we will be competitive.
"In 'X' number of years time we want to be challenging for the big title too."