The Jordan Ibe money was already used/covered in the 2016/17 season spending. They spent roughly £62 million in that season and received £76.5 million in return from sales. Their highest sale across 2017/18 and 2018/19, apart from Coutinho, was Sakho at £24 million.
Like I mentioned, their CL money, sponsorship deals and even the PL money etc would help. They won't start spending stupid money on players but you would imagine they can fork on one or two if they ever need it.
As for Sancho, well, Nicco mentioned about paying in installments which come to think of it, it's might be a possibility and Klopp obviously has connection with Dortmund and all that. So, who knows...