The Hammers will face United away from home at Old Trafford in the Premier League on Saturday afternoon.
“I see a lot of positives in their game,” Bilic has written in The London Evening Standard. “Their home record is great. They don’t concede goals. They are winning games in a hard way, let’s say, but they are still winning.”
United have been far from entertaining so far this season, but they have been effective and have picked up wins without playing particularly well.
Louis van Gaal’s side are defensively very strong and have conceded just 10 goals in 14 Premier League games this campaign.
The Red Devils are only a point behind leaders Manchester City in third place and are very much in the running for the league title.
United will be favourites to win against West Ham on Saturday afternoon, especially as they are at home, although an early goal for Bilic’s side could make things tough for the hosts.
The Hammers are currently eighth in the Premier League table with 22 points from 14 games.