Boilesen will miss the start of the season, probably. I wouldn't know when he's expected back exactly. All I know is that he has starting training again. My guess would be September or October.
Schöne is an excellent piece of business imo: he was free, and he's a great player to have depthwise. He's basically a more experienced but less talented Eriksen. Ajax played better with him on for Fischer yesterday. Ajax really needed another 'no.10' after Aissati's release. With Boerrigter's continued injuries, I can even see Schöne getting into the first 11, playing from the left. If Ajax uses Siem de Jong and Janssen in midfield, it would probably be better to use Schöne (or even better, Eriksen, of course, but he'll probably play in midfield when he plays) on the wing - preferably the left wing, so that Schöne can cut inside. If Eriksen and Siem de Jong/Janssen play in midfield, Fischer or Boerrigter would be better on the wing imo.
Ajax does need a central defender and a right winger, and maybe another striker as well. Daley Blind just isn't good enough defensively - he struggles against the top teams. He's a decent passer, and he's technically decent as well, but he's too slow, too weak, and too sweet, probably. He lacks experience - and therefore tactical awareness - as well. I would buy AZ's Moisander if I were them. If Muniesa wouldn't have been injured, he would have gone to Ajax, probably.
Curiously enough, Ajax are linked to Tello as well in the Dutch media. Maybe he could help sort their wing-troubles out. But Tello is better from the left, probably. Assaidi (Heerenveen) is also heavily linked to Ajax, but he's a left winger as well, and they need a right winger, so I'd find it strange if they'd really buy him.
Siem de Jong, the new captain, prefers to play in midfield, so Sigthórsson is their only real striker now. They probably need a back up, considering Sigthórsson's injury problems last season.
Blind's biggest problem that he is just so slow.When he's up against Mertens, Lens, Narsingh he doesn't stand a chance. Mitchell Dijks did great though, Narsingh couldn't get past him.I hope we go for Gouweleeuw and move Alderweireld to the left.
I don't think we need a right winger. We have Sana, Sulejmani and Lukoki. A left winger would be more than welcome though. Boerrigter(always injured), Fischer(not ready), Ebecilio(Not even going to explain why).