The transfer system at Benfica is simple. Buy low, sell high - it works every time and has been seen once again this summer.
One such example was Lazar Markovic. The Serbian has been flogged to Liverpool for a fee in the region of £20 million. But he only cost the club a fraction of this cost, and this summer Benfica are looking to raid his former club Partizan Belgrade again - interestingly for a player Chelsea have been keen on.
They are said to be leading the race for youngster Andrija Zivkovic. He is a prestigious attacking midfield talent who made his debut for the club in 2013, aged just 16.
Now 18-years-old he has been breaking records ever since. He is the youngest ever player to play for the Serbian international team and is was named captain of Partizan aged just 17 years and seven months - their youngest captain of all time.
The attacking midfielder however is a commodity that Partizan may need to cash in on, the club themselves admitting they are strapped for cash and may have to sell the top Serbian talent.
This week Benfica's interest has stepped up in the player - reports now suggesting they will replace Markovic with his younger and some say, better model.
But Chelsea have also been keen in the past. Jose Mourinho apparently watched him in action for the Serbian national team last year and has been tracking his progress since, according to Serbian football expert Igor Mladenovic.
Which again brings parallels with Liverpool newbie Markovic. Chelsea of course were also keen on the player when he was at Partizan. In fact it was even falsely reported that they had signed him, but loaned him to Benfica for two seasons.
That was last summer and this year they face another battle with Benfica to sign a Serbian talent that many believe will go on to surpass the performances of Markovic.
They might want to move quickly or risk missing out for the second summer in a row on Serbia's hottest talent.
Do Chelsea need to move fast on Zivkovic?