In theory he wouldn't be. I think for us he does fine but the way Chelsea play he would be a liability in possession. We might be able to find a reasonable agreement.... He signed a six-year deal with Chelsea in 2016, so its likely he won't be cheap if we tried to sign him on a permanent deal over the summer. I wouldn't be against it, though, given his performances for us.
I just found out that his middle name is Happy. I like the lad even more now.