The defender came off with a hamstring injury recently and is out of action.
While Chris Mepham put in a good display against Burnley, Sinisterra knows they need more progressive play at times.
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Sinisterra told the Daily Echo: Marcos brings you a lot of things to the team, like that first pass is always clean.
I think we missed that (against Sheffield United), especially when you want to play into space.
But I am sure he will be back soon and he will be with the team very soon."