Nolberto Solano picked out Vassell's dart into the box and the England keeper was out bravely to meet him for a 50-50 challenge after 61 minutes.
'Robbo' averted the danger but it came at a cost. He initially continued after treatment but soon limped off to be replaced by Radek Cerny. In doing so, it was the first Premiership action Robbo has missed this season and Radek's full debut.
Thankfully, X-rays showed no fracture to the upper shin area of his right leg as Robbo basically suffered a 'dead leg'.
Head Coach Martin said: "Paul was brave, he had to come out and Vassell is a very quick player. He's a tough guy but it's a dead leg so I'm hopeful he'll get over it and play next week. He's a very important player for us."
Martin Jol reported that Paul Robinson suffered a dead leg in a clash with Darius Vassell that forced him off in the 5-1 win against Villa on Sunday.