Pellegrini could certainly do with them firing again like earlier in the season ahead of their visit to Barcelona next week where they will try to overturn a 2-0 first-leg deficit in the Champions League.
He said: "In the early part of the season, the partnership was very productive for the team.
"I hope in the future it can be again.
"In other moments when Sergio was injured, Negredo played very well at that time. Dzeko and Negredo, Dzeko and Sergio have also done well together.
"Strikers also live from the goals they score but I trust absolutely that Alvaro will return to his normal performance.
"He will continue scoring goals."
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