Loan signings are considered important for the economy in football. Not only do they offer a way into the transfer market without much economic investment, but they also address short-term needs.Loan transfers must be ones that benefit all parties. In many cases, it is a young or an out-of-favor player going out to get playing time. He gathers the experience while the club that is loaning him gets to address short-term gaps in the squad.On that note, let's look at a few loan deals in La Liga this transfer window.#5 Yangel HerreraAlthough records will show Espanyol loaned Yangel Herrera is from Manchester City, the truth is he has never played for them. He was at Granada for a couple of seasons where he did extremely well. Herrera is actually in the 99th percentile for aerials won by midfielders in Europe per 90. He was linked to Southampton and West Ham as well but eventually went to Espanyol. The Barcelona-based club will be looking to stay up after getting promoted last season.#4 Yusuf DemirFC Barcelona v Gimnastic de Tarragona - Friendly MatchYusuf Demir was originally loaned in by Barcelona from Rapid Vienna. The intention was to get him to play for Barca B and perhaps occasionally for the first team as well. Things have turned out differently for the player now. He is already registered with the first team. It is now extremely possible that he will soon become the first-choice right-winger.Barca have lost Messi, Griezmann and Trincao - the usual occupants of that position. Demir is highly rated in Austria and a lot of big clubs wanted him but he chose the Blaugrana.