I think it is also down to if clubs the players are at are willing to let them go. A lot of selling clubs often will allow a player to leave only after a certain amount of time. I think Sancho is who people are on about. After Dortmund said he would not be sold under any circumstance this year Klopp and Edwards will wait til next year. They may be pooling resources for a bigger splash next year also if the point about waiting on players is correct.
The fee for the likes of Sancho will only increase further and there will be more competition for his signature next season, unless you can agree a naby like deal.
This summer would have been the perfect time to strike, with united all over the place and chelsea having a transfer bam