Several reasons to think its nothing more than lazy journolism.
1) Wages, Koscielny is reported to be on £90k a week. We aren't in a financial position to pay anyone that amount.
2) Wages, I can't see Koscielny being willing enough to drop at least one-third of his income.
3) Status, I can't see Koscielny willingly dropping out of the top tier of football, yet.
4) Koscielny is injured apparently, its been reported that he has had a hamstring injury since pre-season.
So why would we take on another clubs unfit player. Especially when we already have one on loan.
5) What possible benefit would his purchase, or loan, be to this club.