At the back, Bielsa must decide whether to go with new signing, Diego Llorente, or whether he sticks with last week's pairing of Robin Koch and Liam Cooper.
The 26-year-old Costa scored twice in Leeds' 4-3 win over Fulham last weekend to secure their first points of the season. 'I'm referring to the patrimony between him and the institution.
"Leeds United are delighted to announce the signing of defender Diego Llorente".
He was never able to crack Real Madrid's first team during his time at the club but, having since emerged as a senior worldwide for Spain, Llorente is a player that Bielsa believes can step in and contribute in a variety of different roles.
"A very young Leeds back four, shall we say, in terms of gelling together", Deane told BBC Look North.
'We don't have Berardi and with Ben White having left, it was necessary to have two players to count on in this position'.
The seven goals conceded in two games strengthened Leeds' need to fortify their defense.
Bielsa spoke about Saturday's opponents and had big praise for the South Yorkshire side and their manager Chris Wilder.
'They are a very good team and have consolidated and it's a good opportunity to compare ourselves to them, ' Bielsa said.
'In all the derbies I've watched or coached in or analysed, I've never seen an intensity or an importance that is (comparable to) the game between Newell's and Rosario, ' he added.