Federal prosecutors want Yasiel Puig to serve a lengthy stay behind bars after he was convicted of federal crimes earlier this year .

A sentencing memorandum filed in a California court on Tuesday and obtained by The California Post on Wednesday shows that feds are requesting an 18-month prison sentence for the ex-Dodgers star who was found guilty in February of obstruction of justice and making false statements.

Federal prosecutors want Yasiel Puig to serve a lengthy stay behind bars after he was convicted of federal crimes earlier this year. Frederick M.…