Oâ€™Shea cut a frustrated figure after seeing his side score three goals only to suffer a narrow defeat to Chelsea in a compelling game at the Stadium of Light.
â€śYou canâ€™t score three goals against Chelsea and not come away with something â€“ thatâ€™s the frustrating part,â€ť he told safc.com.
â€śWe always analyse the goals and individually and collectively and we can always do better. Thatâ€™s what weâ€™re going to have to do.
â€śIf you score three goals you generally think youâ€™ll get something from the game, so to not do so was disappointing.â€ť
He added: â€śThe reaction at the start of the second half and right towards the end [was good] â€“ we were well in there.
â€śBut we need to be defending much better in terms of keeping clean sheets. We got one at Aston Villa but needed to do better tonight.â€ť
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