In short
Only the league admin can undo a transfer.
It only works for the player's most recent transfer.
Applies to purchases and sales.
Support can not undo transfers.
When does this help?
You sold a player by mistake
You paid too much by mistake (overpay)
You confirmed the wrong bid
Step 1: Was it the most recent transfer?
The admin can only undo the most recent transfer of a player.
If the player has since been sold on or bought by someone else, that new transfer is now the "most recent" one. Your transfer can then no longer be undone, not even by the admin or support.
Step 2: Contact your admin
If it was the most recent transfer, your admin can undo it like this:
In the League tab, tap the wrench icon next to League Events
Select Undo Transfer
Good to know:
Can be used as often as needed during the season, at any time
Automatically shows up in the league's Activity Feed
All managers in the league receive a push notification
Possible error messages
Even if it's the most recent transfer, undoing it can fail if it would break a rule:
Squad limit reached
Players-per-club limit reached
A negative budget would violate the 33% rule
Only one error message is shown at a time.
Alternative for overpays: credit the difference
You paid too much and the transfer can no longer be undone? If your league agrees, here's another way:
Sell the player to Kickbase at market value.
Your admin credits you the difference between the purchase price and the sale price via Penalties & Bonuses in the Admin Settings.
⚠️ Important:
Bonuses take effect immediately and cannot be undone.
Each manager has a season limit of €50M for penalties and for bonuses.
Unfortunately, this alternative doesn't help if you sold a player by mistake.
Tip: Set rules in your league in advance
Since support can't correct transfers, it's worth agreeing on these together at the start of the season:
How do you handle accidental sales?
How do you handle accidental overpays?
Ideally, add the rule to the league description so everyone can see it.
FAQ
Can support undo my transfer? No. Only your league admin can, and only for the player's most recent transfer.
I'm the admin myself. Can I undo my own transfer? Yes, as long as it was the player's most recent transfer.
The player has already been sold on. What now? Then your transfer can no longer be undone. If it was an overpay, your admin can still credit you the difference via "Penalties & Bonuses".
How often can the admin undo transfers? As often as needed, at any time during the season.
Will other managers see that a transfer was undone? Yes. An entry appears in the Activity Feed, and all managers receive a push notification.