Sam Allardyce fired a parting shot at Benni McCarthy ahead of the striker's expected £2.5million move to West Ham.
The Blackburn manager said McCarthy will have to rely on his younger team-mates for support and suggested the 32-year-old could be a flash in the pan at Upton Park.
Allardyce said: 'He's not getting any younger. The legs are not quite as good but the talent is still there so, if you can get other players around him to do the workload, then he'll use the talents to get you chances and score you goals.
'He generally is the best he is when he first goes to any new club. When he came to Blackburn he scored 23 goals in his first year and hasn't quite replicated that since.'
Not surprisingly, West Ham boss Gianfranco Zola argued McCarthy would bring some much-needed experience to his relatively young side.
He said: 'He's got quality in the last 20 metres, he's got goals in his bag and that's what I need right now.'
Battle ground: El-Hadji Diouf (centre) fights for the ball with Valon Behrami
West Ham's pressing need for a striker was exposed in Saturday's dour stalemate. Frank Nouble worked tirelessly as the lone front man but was too isolated until West Ham switched to 4-4-2 when Carlton Cole, playing just his second match since November, came on after 57 minutes.
Blackburn argued they should have had a penalty when Mark Noble handled on the line while substitute Jason Roberts ought to have scored when he turned James Tomkins, but saw a tame shot saved by Robert Green. At the other end, Alessandro Diamanti's left-foot effort was tipped over the bar by Paul Robinson.
West Ham 0 Blackburn 0: New owners but same old problems for HammersBenni McCarthy faces wait as work permit issues hold up West Ham moveMcCarthy set to join West Ham after Blackburn agree £2.25m fee for strikerEidur Gudjohnsen snub leaves West Ham boss Gianfranco Zola feeling bitterBLACKBURN ROVERS FC