GSEA number dimension of expression dataset

Question

[edoardofilippi1998]

I need to perform a gsea on scRNA data, but on a subset of the dataset with a low number of genes., how do I select the gene set sizes in relation to the dimension on my expression dataset? Or, what is the minimum number of genes I can run the GSEA on, and how can I select the correct parameters according to the number of genes I have?

I hope the question is clear enough, thank you in advance.