Both players featured in yesterday's defeat at West Ham United.
"He was excellent in his first couple of outings." Cole told Liverpoolfc.tv. "He's a goal scorer and exactly the type of player the club needs to buy.
"It's a big jump from the Dutch league to the Premier League, but looking at what he's got in his ability and attributes, it shouldn't be a problem for him.
"He's going to be a good signing for the club. Hopefully Luis can give us the kind of form he showed for Ajax and at the World Cup."