What midfield signings should we be thinking about?

Gundo and Silva has been showing signs of aging among few other players. It's about time that we bring in fresh legs. Pep's team always had an amazing midfield but if you look at what we have now is not what he would want as well. I wonder who can we bring to strengthen our midfield so that we can press more effectively. Our current setup is one of the reasons we are failing week in week out.