West Ham boss Manuel Pellegrini says they must be wary facing Norwich City striker Teemu Pukki.
The Finn has been superb for the Canaries in the opening weeks of the season.
Pellegrini said, "When you have a change in competition, there is always some players who feel the difference. I think Pukki is demonstrating that the Premier League is not difficult for him. He's scoring goals and we will need to be careful of him.
"I expect a similar game to the one we played against Watford. Norwich play this system and they played exactly the same way against Chelsea and Liverpool. They are a very good team and we will need to play a very good game to get the three points."
