Only till a few days back, Robert Lewandowski was primed to join European champions Bayern Munich over the current summer transfer window.

However, with Borussia Dortmund  sporting director Michael Zorc stating that the Poland international won't be allowed to move to the club's arch-rivals, English champions Manchester United have re-emerged as the favorites to secure the services of Lewandowski.

Wayne Rooney is expected to leave Old Trafford in the transfer season and bookies expect David Moyes to replace the England international with Dortmund's in-form striker.

Bayern Munich were 'consistently regarded as the favorites' to sign Lewandowski, but with Dortmund adamant not to sell their prized asset to their domestic nemesis, United are now the frontrunners (2/1), ahead of  Chelsea (8/1) and Arsenal (10/1).

The Red Devils are ready to increase Lewandowski's salary from £2million a year to nearly £4.7million a year if he joins them.

Furthermore, United have now been told they can have the Polish star if they offer £25.5m.

Lewandowski is entering the final year of his contract and is unlikely to remain Signal Iduna Park next season. He had a phenomenal 2012/13 term with Dortmund, scoring 36 goals in just 48 appearances.  

The 24-year-old had apparently agreed personal terms with Bayern and was stunned when he got to know about Dortmund blocking his potential move to the Bavarians.  

Lewandowski said: “I do not think that this is the final decision and I expect the situation to change.

“I am enjoying my holiday for now but I hope things move forward pretty soon and the situation changes.

“I do not get upset about anything.”

Meanwhile, reports also suggest that if United do buy Lewandowski, Bayern will probably look to sign Liverpool's Luis Suarez instead.