The phrase "an additional player that" is correct and usable in written English.
It can be used when referring to an extra participant in a game, team, or any context involving multiple individuals.
Example: "We need to recruit an additional player that can help us improve our chances of winning the tournament."
Alternatives: "an extra player who" or "a further player that".
Using this genetically sensitized condition, we performed a genetic screen to identify additional players that function with Baz to regulate photoreceptor morphogenesis.
We performed a genetic screen to identify additional players that function with Baz to regulate epithelial structure in the Drosophila embryo.
We even have open-world rift raids that will require a core organized group to tackle, but which encourage additional players that walk by to join in!
Since the identification and cloning of the first mammalian clock gene, CLOCK, two decades ago (Vitaterna et al., 1994), the field of chronobiology has uncovered many additional players that regulate circadian rhythms on a transcriptional and/or post-transcriptional level, and many more such candidates are currently being evaluated.
We therefore suggest that control of β-mRNA translation in the reductive phase that prevails at G2/M should have additional players that control the interactions of trans-acting factors of the 3'UTR with its target to allow the translation of the mRNA in such unfavorable metabolic situation.
Moreover, further genetic screens might identify additional players that control sperm competition.
Period shortening in light-grown hmr-2 seedlings in response to various Fe supply also reveals that an additional player might be involved in the coupling of the circadian clock to Fe responses.
If Kent State really wants to slow down the game it needs to pull an additional player off the offensive boards and dedicate that man to getting back.
Given the genomic organization, we suspect that this regulator is an additional player in the control of ino1 expression.
