Under new manager Vítor Pereira, Nottingham Forest secured a convincing 3-0 win at Fenerbahçe, while Stuttgart overwhelmed Celtic 4-1 at Parkhead. Both English clubs now have commanding leads ahead of their second-leg matches.
Forest, back in Europe after three decades, has not conceded a goal in its last three home European games. Celtic's caretaker boss Martin O'Neill acknowledged his team faces an uphill battle but vowed to "go there and compete" in the return leg.