Weimann said: "We are all looking forward because Old Trafford is a brilliant place and I think we will go there positive.
"Manchester United have been a top team for years and to go there is special.
"It's not long ago that Gabby [Agbonlahor] scored the winner there so why not again? We drew against a big club away in Liverpool and won at another in Chelsea so why can't we do it again?"
A win for Manchester United will ensure they move five points clear of Manchester City at the top of the table.