You need a rotation left back to replace Shaw from time to time. Lucas Mareque is very good and he is free player, hire him even he ask higher wages. He worth it, and will play very good two years.
You need a rotation goalkeeper, I suggest to hire Julio Cesar, a Brazilian goalie, free player.
You need better center backs, you can obtain services of Kyle Bartley for only 3M Euro. You will play him along side with Lovren.
I doubt that you can have enough funds to buy more players. You have to sell someone, but in my save I couldn't sell anyone. I tried with Gaston Ramirez, Jos Hooiveld, Paul Gazzaniga, Kelvin Davis, Guly do Prado or Maya Yoshida. I succeeded to loan some players and to keep lower wages budget. Then I could buy Ayoze Perez with 2M Euro. I bought him because Lallana could be easily injured.
Because both Shaw and Clyne are superb wing backs, with good dribbling and crossing, I recommand to use them as full-back with duty attack. I used a lot 4-3-2-1 formation with MPLS tactic
http://www.fm-base.co.uk/forum/shar...-strong-attack-strong-defense-undefeated.html