The phrase "as probably one of" is correct and usable in written English.
It can be used when you want to express a likelihood or possibility regarding a person's status or role among a group.
Example: "She is regarded as probably one of the best artists of her generation."
Alternatives: "likely one of" or "possibly one of".
"John is recognized worldwide as probably one of the best in conducting both counterterrorism and counterintelligence operations," Mr. Mawn said.
Kureishi, meanwhile, has ranked the "character" of Hermann as "probably one of [Kafka's] best literary creations or fictions".
The group counts the current campaign in support of WikiLeaks as "probably one of [its] most high profile yet".
This race was seen earlier in the year as probably one of the most competitive in the state — and one that could determine whether Democrats gained control of the Senate.
While his agency is facing harsh criticism, Patrick Rhode, FEMA's deputy director, defended its performance as "probably one of the most efficient and effective responses in the country's history". He recalled that after Mr. Brown, his boss, returned from his tsunami tour, he asked if the United States was better prepared for a disaster than the ravaged countries he had visited.
Admiration for Ramsey Clark as probably one of the best Attorneys General in American history requires that his Oct. 21 letter to The Times be answered, for the implications of that letter [supporting Richard Ottinger] are an unfair testament to him.
DCI Tim Duffield, who led the successful homicide investigate, described Port as a "probably one of the most dangerous individuals I have encountered" and a "voracious sexual predator" who was "highly devious, manipulative and self-obsessed".
The process, known as photosynthesis, is probably one of the most remarkable functions on the earth.
The "International Conference on Genome Informatics", popularly known as "GIW", is probably one of the oldest, if not actually the oldest annual, regular conference in computational biology that survived all turns of the tempestuous development of this field of research [ 1].
It's sad to see Badminton in the Doldrums as it is probably one of the most accessible sports in the UK with just about every sports centre having the necessary facilities.
Adjustment #2, Drugs: OK, I am a total wash-out here, as I am probably one of three people who came of age in the last 50 years who never took any illegal substances (although, I did flirt with a pre-illegal substance in the '60s, the artificial sweetener cyclamate before it was banned for causing cancer).
