The U’s have agreed a compensation package for the winger, 23, who had been offered fresh terms by Charlton.
But we reported all along that was only to ensure the SE7 outfit were covered if the attacker met his potential.
Fosu has linked back up with Karl Robinson, he played his best football at Charlton under the Liverpudlian.
“He’s a really talented player,” said Robinson. “He has so much skill, can be direct and he knows the league. Last summer we had a major rebuilding to do and it took time but this season we already have the core of a good squad here and adding players like Tariqe continues to strengthen us.”
Fosu added: “I’ve played against Oxford a few times now and always thought they were a good team who played attacking football. I enjoyed working with Karl and I know the chairman from his time at Reading, so those two were big factors in coming here.
“But the biggest thing was to join a good club who have big ambitions and I know I have found that here.”
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