FRANK Lampard admits Chelsea do not know how long Tammy Abraham will be sidelined with a recurrence of his nagging ankle injury.

Abraham hobbled out of Chelsea's warm-down following Tuesday's 3-0 Champions League loss to Bayern Munich at Stamford Bridge and is set to miss tomorrow’s showdown at Cherries (3pm).

"For Tammy, we are trying to find a solution, it's obviously frustrating that he comes in and out somewhat," said Lampard.

"But he's injured."

Asked how long Abraham will be sidelined, Lampard added: "I don't know, we need to see. I speak to the doctors every day about it but we are not actually clear on that one.

"At the minute he's not doing anything active for the next couple of days. So I don't know - and I don't know how long that will be."

Christian Pulisic, N'Golo Kante and Callum Hudson-Odoi will also miss Chelsea's trip to take on Eddie Howe’s men.

But Ruben Loftus-Cheek will be back in the squad and could make his first appearance since having Achilles surgery in May.

"Ruben's in the squad again tomorrow, we haven't had great opportunity to get Ruben game time as much as we'd want," said Lampard.

"I felt at Tottenham he could be an impact of some sort in the game and that would have been great for him to get some minutes.

"Bayern was a different animal, so I took a different decision to get some good training in the week. But now he's back in the squad.”