The Turin powerhouse's general director is full of praise for both attackers but fears a summer transfer for either player could prove problematic.
A number of recent reports suggested that the Bianconeri are interested in signing either player as they are looking to strengthen their attack ahead of the 2013-14 campaign, but the 56-year-old believes both players are likely to stay at their current clubs.
"Robben and Alexis are two excellent players and I admire both of them. There is not much more I can say about it at this point, though," Marotta told the Corriere dello Sport.
"Sanchez is with Barcelona and they paid a significant transfer fee for him. I think that he will stay at Barcelona this summer. Robben is a player who plays with a lot of authority and has a lot of ability. But he plays for one of the best clubs in Europe at the moment ..."
Alexis, 24, has a contract with Barcelona until the summer of 2016, while the 29-year-old Robben's deal with Bayern expires in 2015.
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