We look incapable of building decent attacks without Rooney playing a deeper midfield role. If we're serious about improving, we should be looking for a good midfield passer. And when I say "good," I don't just mean "90% completion rate" (nice as that is). We need someone who pushes the team forward and can create chances more directly, not an accurate-but-safe type.
Seri would be great but we have no chance of getting him. I'm not sure how much he'd cost, and the asking price might be prohibitive since he plays in England, but I'd have a look at Tom Cairney from Fulham. He's consistently been one of the best creative midfield passers in the Championship, even playing for some awful Blackburn teams, and I think he'd shine given a chance at a higher level. I'll also mention Yassin Ayoub from Utrecht. He's shown creative potential and does more defensive work than Cairney, although he doesn't appear to be as consistent on the ball in general (only an about an 80% completion rate compared to around 90% for Cairney). Bonus points for playing for a club that would be easier to strong-arm in transfer negotiations.