Premier League for big money. The likes of Virgil van Dijk and Victor Wanyama have come through Celtic, while Ryan Fraser was at Aberdeen and John McGinn became an Aston Villa hero after moving from Hibs.
The flow of top talent is only going to go one way given the vast resources south of the border - but that doesn't mean there aren't bargains to be found.
Indeed, a look at the Championship throws up a number of players who Celtic or Rangers could tempt north of the border on a free transfer.
Here takes a look at the division's five most eligible free agents. The Bristol City winger has already been scouted by Celtic and will be a free agent this summer.At the age of just 24 he can still improve - not to mention potentially generate a big.
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