Keisuke Honda - a deep lying playmaker whose renowned for his workrate and technique. He moved to AC Milan on a free transfer
Radja Nainggolan - a hardworking defensive midfielder. Radja injects steel and workrate in any team. He signed with Roma on loan for 3m euros with a buying clause of around 7m
Feel free to add to more
Why would we need Honda? We already have enough problems to accomodate all our No.10 we have (Rooney and Kagawa) while Januzaj can do a good job there too. Also, Honda isn't as good as Shinji and he is even less versatile. In fact Honda isn't versatile at all, he can play only one position.
Haven't seen much of Nainggolan but is he really that good? I think that at the moment we need to sign a few first team quality players, not squad players. Our squad has amazing depth but we are short of quality on firs 11.