West Ham are due to face Sunderland at the weekend, and Bilic has warned his side about being complacent going into the fixture.
The Black Cats may be stuck in the relegation zone as things stand, but the Croatian boss is wary of the threat that they can pose.
SB: "Sunderland are very organised, they are showing not only the quality but the character. They got four points from Liverpool and Man Utd— West Ham United FC (@whufc_official) February 25, 2016
SB: "They have a quality not only on breaks, but also in different ways. There is still a long way to go for them...— West Ham United FC (@whufc_official) February 25, 2016
"...but they have a big chance to stay in the league."— West Ham United FC (@whufc_official) February 25, 2016
Sunderland’s form has improved since the January transfer window, when they added five new players to increase the quality of their squad.
The Black Cats have looked dangerous in recent weeks, and they have spent the past week training in Dubai, to iron out any faults that Sam Allardyce has seen in their play.
The Hammers go into the contest at Upton Park in good form, themselves, though.
West Ham have lost just two of their last 17 matches in all competitions, and they are battling for a spot in Europe.
West Ham are currently in seventh place in the Premier League table, but they could climb all the way up to fifth if they are able to beat Allardyce’s relegation threatened side on Saturday.