Tammy Abraham injury update provided by Chelsea boss Frank Lampard

Striker Abraham suffered a hip injury during the Chelsea's Champions League draw with Valencia - and is now set to miss out vs West Ham on Saturday

Tammy Abraham will miss Chelsea's Premier League clash with West Ham on Saturday.

Striker Abraham suffered a hip injury during the Blues' Champions League draw with Valencia - and was forced off at half time as he struggled in pain.

But the Blues are still unsure how long the England front man will be sidelined for with hip trouble.

Abraham sat out training at Cobham on Friday and will definitely sit out the meeting with the Hammers at Stamford Bridge.

Manager Frank Lampard expects Chelsea to know by Monday the extent of Abraham's hip issue, a problem he suffered in the Blues' 2-2 Champions League draw at Valencia on Wednesday.

"We'll know by the end of the weekend, he's got some pain and won't be involved tomorrow," said Lampard. "But then we'll know by Monday."

Abraham landed awkwardly on his hip in Chelsea's Champions League clash at the Mestalla and was carried off on a stretcher at half-time.

The 22-year-old insisted straight after the match that his injury was not as bad as he had first feared, but the Blues are still assessing their star striker.

Michy Batshuayi replaced Abraham off the bench in Valencia and will battle it out with Olivier Giroud to lead Chelsea's line against West Ham this weekend.

Abraham has fired 10 goals and laid on two assists in a blistering Premier League start this term, but Lampard insisted he is confident the Blues boast the firepower to cope in his absence.

"The other lads have been training well, every day is a work day so whenever chances come they are ready and I have every confidence in them," said Lampard.

"Michy has shown work ethic and quality, which I knew anyway. It's not easy when you're not playing as many minutes as you'd want."