Which leaves are turning yellow? Inner, new, or all?

If not a nutrient problem, I would guess too wet or too dry.

It's a number of leaves. I watered it well yesterday, so I will see what happens in the next few days. If it's not that, I may try a fertilizer.

If it is the older leaves that are turning yellow (not necessarily the bottom leaves), than it is probably normal adaption from transplanting.