Authentic Player shirts have a plastic Barcelona crest, extra large TV3 and LFP logos, air holes and those blue T-shaped stickers to hid the stitching on on the shoulders of the sleeves.
Such shirts can be purchased by the average fan but they cost around £99 without a name or number. subsidesports were selling them last season but I don't think they have stocked any for this season. Maybe they didn't sell very well.