Either the club thinks they can get more money for him down the line or they think he still has a possible future with us and they want to see him grow more out on loan right now.
Could be all three but going by his Preseason, he certainly wouldn't make a bad backup option to Pique. only thing is that the Non EU spot situation prevents us from that happening.
I think that it is because of Mina.
Mina is our best transfer in the last 10-20 years, right?
Did we ever earn this much on any player (a pure profit)?
And since Marlon is not any worse than Mina, the board will sign a new contract with him, and he will improve on a loan this season.
He was already on a verge of a 15M transfer.
With a good season this year, he can easily get sold for 15-20M next summer to EPL.
Also, I wouldn't be surprised if your scouting network will now turn to South American CBs for 5-10M, whom we will try to develop/loan/sell in the same way as Mina/Marlon.
We will earn more from Mina&Marlon than from all La Masia sales and from all sales in the last 10 years regarding a pure profit (if we bought Fabregas for let's say 40M and sold for 45M, then the profit is 5M, not 45M).
With developing/selling CBs, we will be able to get more funds for 100M wingers, attackers and similar.