Enzo Maresca says Liam Delap's shoulder injury looks "quite bad" and fears the striker is set for another long-term lay-off.
Delap was forced off in the 32nd minute of Chelsea's 0-0 draw with Bournemouth on Saturday after landing awkwardly on his shoulder after a tussle with Marco Senesi.
He left the pitch with his arm in a makeshift sling.
Delap, who returned from two months out due to a hamstring injury at the end of October, has managed just 17 appearances in all competitions, including the Club World Cup, since his summer move to Chelsea.
"Unfortunately, he has already been out for two months, and he has to be out again," he said.
"We don't know for how long, but it looks quite bad, his shoulder.
"He has been unlucky. We are also a bit unlucky because we need that kind of a No.9."
Delap has scored just two goals for Chelsea so far, with his first coming in the Club World Cup before netting against Barcelona in their 3-0 Champions League win.
He still awaits his first goal for the Blues in the Premier League, having had 12 shots in total in the competition.
Mckizboy
0
He is wearing the number 9 shirt. What do you expect?
AshKingfj
0
that's what u get after buying a 1 season wonder player
Orobosa77
0
Jackson's karma. this man sucks bring back nico
Yes
Richardoghale
0
United dodged a bullet thank God 🙏🏾
Where is Sesko? United yeh yeh yeh
sepabdeiou
3
His style doesn't suit Chelsea he should be sold ASAP
Moebdeuy
1
Delap injured for the 2nd time in one season which is yet to end...Jackson was a better option
Jiuadikpsz
0
Good signing for Chelsea to check and balance the account. Let him do the rehabilitation for a couple of years at the club
Liucimouyz
0
Delap, please change that cursed 9 and you will do better 🤗
jesciklruy
2
Jackson's karma. this man sucks bring back nico
reeabiklu
3
United dodged a bullet thank God 🙏🏾
Bepipstyz
4
Man u dodge a bullet here
Bepipstyz
2
Manchester United really dodged a strange bullet here.
layacdkpuy
3
he should not for Chelsea again because he is a simple waster
Whuligan
0
He's just unlucky since signing for Chelsea injury after injury