And, in his first column for the club's website, Sullivan compared 23-year-old Obiang with the experienced Leicester and former Inter Milan and Real Madrid midfielder.
He said of the midfield duo: "All the talk now is about what players Slaven will bring into the club and I get constantly hassled by all my school mates asking if we have signed anyone. I try and keep quiet as much as possible.
"It has been great to see Pedro Obiang come into the Club this week. I watched him play against Napoli last season and he is very similar to Esteban Cambiasso.
"I like that he rarely loses the ball and he has been one of the star players for Sampdoria."
So where does that leave West Ham's reported interest in the Argentine?
It's interesting that the son of the co-owner has mentioned the midfielder just a day after he has been linked with a move to the club - and the comparison is certainly one full of praise. At the same time, of course, Obiang being 'similar' to Cambiasso may make the case for West Ham not needing both of them.
On the one hand, the 34-year-old Champions League winner would bring great experience to Upton Park - as he has done Leicester City. Another, less attractive word for experience, however, is 'age'...