The 110lb bomb was discovered by builders near Wembley Arena and a number of local residents were evacuated from the area.
Wembley Stadium said on its Twitter account: "This weekend's games remain unaffected & we look forward to welcoming supporters of all six @football_league Play-Off finalists to #Wembley."
Southend take on Wycombe in the League Two match on Saturday at 5.30pm, Preston meet Swindon in the League One game on Sunday before Norwich take on Middlesbrough in the Championship final on Bank Holiday Monday.
The unexploded bomb is thought to have been dropped by a German bomber during the London blitz in the early 1940s.
Source : PA
Source: PA