Cazorla believes Ba will be Besiktas' key man[GETTY]
The Gunners travel to the Ataturk Olympic Stadium to face the Turkish outfit in the first leg of their Champions League play-off clash.
Ba joined the Black Eagles earlier this summer from Chelsea for a fee of around £5.25m, scoring three goals in two outings already.
The Senegalese striker enjoyed three successful seasons in the Premier League at Newcastle and Chelsea, with a short spell at West Ham, netting 43 times in 99 appearances.
And Cazorla believes Ba will be Besiktas' key player tonight in Istanbul.
Santi Cazorla Player Profile
We better watch out with him, he he will be a leader for them
Santi Cazorla
“He is a great footballer,” Cazorla said on 29-year-old Ba.
“He proved that here in Premier League, playing for Newcastle and Chelsea. He is a great signing for Besiktas.
“We better watch out with him. He he will be a leader for them and we have to be careful because he has scored a few goals against us.
"If we don't keep our eyes on him then we will be in trouble.”
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