The phrase "an influential player in" is correct and usable in written English.
It can be used to describe someone or something that has a significant impact or role in a particular field or context.
Example: "She has become an influential player in the tech industry, driving innovation and change."
Alternatives: "a key figure in" or "a major contributor to".
During the war years, while Donovan traversed the globe developing his spy network and becoming an influential player in international affairs, Hoover remained in Washington plotting and scheming.
Howes, the national secretary of the Australian Workers Union and an influential player in the NSW Right, was thought by colleagues to be Carr's obvious replacement.
In its complaint, Harland Clarke takes direct aim at Mr. Milken, who over the last several decades has become an influential player in the profit-making education field.
Tehran is also now an influential player in the Palestine question, having forged close ties with the ruling Islamist movement, Hamas.
But it may be more difficult to take a hard line with Brazil, which has become an influential player in global trade talks in recent years.
The MQM, an influential player in most previous federal coalitions, is now out of government in Islamabad, and facing what Mr Alvi says is the biggest challenge left to its dominance of Karachi.
Photograph: Uriel Sinai/Getty Images 11.53am GMT Israeli attack 'must not pass unpunished' - Qatar Qatar, an increasingly influential player in the Middle East in recent times, having sent troops to Libya and arms to Syria, has strongly condemned Israel's military operation.
India is an increasingly influential player in the global pharmaceutical market.
Dunne arrived at St James Park in 2009 and established himself as an influential player for the Devon side, featuring in 110 league games and scoring six goals.
Greg [Eden] is a very influential player in our team and he's a great attacking full-back".
The plan promises to make Brazil a more influential player in global climate-change discussions, helping to push the United States and the European Union to agree to emissions cuts and head off the adverse effects of climate change.
