Read something earlier saying that Alex Neil has stated that he wants to bring in 6 players this summer. When asked if that includes Dorrans and Mulumbu he said that it did. Meaning that we're only likely to sign 4 more players.
I think it's fairly obvious that we want a striker, after having a bid rejected for Mbokani, and enquiring about Gestede. As well as the reported interest in Glenn Murray. It's also clear we want a left winger, hence the bid we've put in for Robbie Brady. He would also be ideal as he can play left-back, and considering that we no longer have a back-up left back now that Garrido's left, we'd almost be killing 2 birds with one stone if we bring him in. That's assuming that Toffolo isn't ready for the step up. That leaves 2 more signings, which presumably would be a centre back (we've been linked with Van Dijk and Baffo), and a right back (we've been linked with Yedlin and J.Richards).
If we were to bring in Gestede/Mbokani, Brady, Yedlin and Van Dijk, obviously adding to Mulumbu and Dorrans, I would be very happy with our business this summer (assuming that we didn't sign them for extortionate fees).