Not large enough to provide an improvement @loketi 

THANKS I have other player images that are not included in fm manager, what should I do to create them??thanks

This megapack is only for people who are in the official database. As you can imagine, we have enough work without spending time on people who aren't in the game.

If you want to try cutting them yourself, this thread contains guidelines for what we're looking for in our cuts in terms of dimensions, snow, collars, face orientation etc. and video tutorials for each element.

I would recommend using remove.bg, which is a free online tool which removes the background to an excellent standard, for free and almost instantly.

Here's a couple of videos on how to use it, one when combined with Photoshop and another using photopea.com, which is a free online app so close to Photoshop that it has the same shortcuts, layout and icons.

If you don't have Photoshop, photopea.com is the tool I would recommend to use to tweak the draft cut produced by remove.bg. It's more powerful and versatile than GIMP and other similar tools.

THANKS, that I understood what I would like to do is add new photos as well as new non-existing players to the official database

Then you need to get in touch with SI on the official forums so that you can offer your services as part of the official research team, if a vacancy exists 👍