Again, while O'Donnell had a decent Euros and is a good full back at SPFL level, I'm not sure his form with us will mean a stampede of clubs looking to sign him. Celtic is a possibility, would Aberdeen , Hibs or Hearts be willing to pay a fee, even if it was set relatively low.
I could be proved wrong, of course. Cadden attracted interest from down south and O'Donnell is a better player than him but there is a marked age difference there.
Time will tell, I guess..