They really need to reinforce their squad this window or they will likely fall further down the table. One thing is having money, but if they lose that draw of being a top club, or at least that big potential of being one, then getting world class players quickly becomes much more difficult. In such a scenario they would really have to start relying on great scouting to find potential world class players, a good dose of luck for those players to actually flourish, and last but not least a great coach that could get such a team back to the top. They can't float on past glory too long, football is filled with middling clubs with a trophy cabinet full of old trophies.