GK - Jeronimo Rulli
CB - Doria (probably not still available), Balanta (see Doria), Van Dijk (Prem Quality), Rever
FB - Jonathan Silva, Ben Davies(unlikely but possible), Jetro Willems, Gotoku Sakai, Nathaniel Clyne, Danilo (FCP)
CM - Thomas Carroll (Creative machine), Stefan Johansen, Sergi Roberto, Goretzka (maybe)
MR/ML - Kacaniklic, Joel Obi, James McClean, Redmond, Giacherinni, Ilsinho (you probably sold him though?)
AMR/AML - McGeady, Jose Sosa, Zoran Tosic, Wellington Nem (i hope you kept him), Massimo Bruno, Sadio Mane, Boerrigter, Vlad Weiss, Zakkaria Bakali.
AMC - Adel Taarabt, Eyserric, Angel Correa, Maxi Meyer, Tonny Vilhena.
ST - Rescaldini, Facundo Ferreyra, Luciano Vietto, Finnbogason, Yassine Benzia (my personal favourite), Amido Balde.
I have NO idea what formation you're using, where your team is weak, how your team plays, so I can't really narrow it down, if you post a screenshot of your tactics, and team then we can help you better.