The phrase "a main player for" is correct and usable in written English.
It can be used to describe someone or something that plays a significant or important role in a particular context or situation.
Example: "In the recent negotiations, she was a main player for the company, ensuring that their interests were well represented."
Alternatives: "a key player in" or "a major contributor to".
"He doesn't look out of place and he's a main player for us this year.
After the crushing defeat Redknapp said: "He's a main player for us and he's been linked every day, even this morning I'm driving in suddenly there's [a report of] a £40m offer coming in from Chelsea.
The panel, however, does not include nanog, a main player for pluripotency acquisition [ 19], since no homologue has been described either in zebrafish or Xenopus.
William Millinship, invariably known as "Bill", who has died aged 80, was a main player on the Observer for nearly 40 years – from David Astor's heyday as editor to the turbulent times in the early 1990s before the Guardian bought the paper.
It is obvious that the main player for the phenomenon of electromagnetic wave transmission through an over-dense plasma slab is the excitation of the surface wave.
The CD46 receptor is still the main player for MV-Edm spreading between cells.
The phenotype looks pretty weak compared to model predictions, suggesting that strigolactone must not be the main player for the basal repression.
Besides, the main player for firing rate compensation (i.e., the temperature dependence of potassium channel kinetics, Q10(n)) has only little impact on the potassium-current-based metabolic cost.
Here we take a look at the main players for beginners, enthusiasts and freelance professionals.
With so many superheroes to choose from (even with Spider-Man, the X-Men and Fantastic Four currently tied up at other film companies) the studio ought to be able to get away with resting its main players for a couple of years to help rebuild audience anticipation.
But the third series has just delivered a ballsy character death that has knocked the main players for six, suggesting some steel beneath the suds.
