Borussia Dortmund star Mats Hummels has warned his teammate Erling Haaland that 'the grass is not always greener on the other side' ahead of next summer's transfer window.
Both Manchester United and Manchester City have held an interest in Haaland, who has established himself as one of the world's best strikers with 68 goals in 67 games since moving to Germany.
He is still just 21-years-old, too, and unsurprisingly is attracting interest from some of the world's biggest clubs, including the two Manchester sides.
United had settled on Haaland as their priority centre forward target in last summer's market but opted against signing a striker after Edinson Cavani decided to extend his stay at Old Trafford.
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