West Ham face Chelsea in the Premier League tomorrow lunchtime and Julen Lopetegui is sweating on the availability of two stars. After Millwall and Spurs, Chelsea have traditionally been one of West Ham’s biggest rivals down the years – on and off the pitch. So when the Blues come to the London Stadium on Saturday it gives Julen Lopetegui the perfect opportunity to win over any of his West Ham doubters. Like Chelsea, the Hammers have had an indifferent start under their new boss. Performances have been bitty and both West Ham and the Blues have looked vulnerable at the back. West Ham have won …