The phrase "a big player at" is correct and usable in written English.
It is typically used to describe someone or something that has significant influence or importance in a particular field or context.
Example: "As a big player at the tech conference, she was invited to speak on several panels."
Alternatives: "a major contributor in" or "a key figure in".
It seems only a big player at a knock-down price will be of appeal to the north London club.
But many in Washington think he is "full of bluster, and would like to be a big player at the table", says Stephen Sestanovich of the Council on Foreign Relations, but that "he isn't really up to it".
Scott was a big player at Hibs, he knew it was a big step to come to Celtic, he knew he had to be patient and work hard and he has never said, 'I need to play' to me.
The days when Britain was a big player at international summits on other matters may also be gone: "On the development agenda, climate change, the high-water mark of our influence may have passed.
There was nonumpiring news Tuesday, led by C. C. Sabathia's latest spectacular performance for the Yankees, as detailed by The New York Post's Kevin Kernan, and the feeling that Texas is aiming to be a big player at this weekend's nonwaiver trade deadline, writes Ken Rosenthal on Foxsports.com.com
"He's a big player at this level and he can be helpful for us, so we need to get him as fit as we can".
It was set out directly to attack a "big player", she says, hinting at Microsoft.
And size matters; having 'ão' at the end of a name signifies a big player (Luizão - Big Lou); having 'inho' at the end of a name signifies a little one (Robinho - Little Robson).
Earlier this year, Indian authorities moved swiftly to contain the fallout from a big accounting fraud at Satyam Computer Services, a big player in India's prized outsourcing industry.
"It's significant because California is a big state, a first mover and really a big player," said Ryan Calo, a law professor at the University of Washington who studies autonomous vehicle law.
The Farc, which stands for the Revolutionary Armed Forces of Colombia, began as a peasant revolt, became a big player in the cocaine trade and at its strongest had 20,000 fighters.
