Frank Lampard has revealed that a brick was thrown at the Chelsea team coach as it arrived at Upton Park for Wednesday's game against West Ham.
|Lampard left West Ham for Chelsea in 2001|
The Blues midfielder said: "The window got shattered. It made a huge bang. But that's football - it happens because there are emotions.
"There isn't too much point on dwelling on it as long as no-one gets hurt."
Emotions ran high as Lampard and team-mate Joe Cole returned to their relegation-threatened former club.
A Chelsea spokesman also played down the incident.
"It was a rock of some sort and it cracked a window of the coach. But none of the players were injured and none of them were sat by the window that was hit."
Chelsea won the match 4-1, thanks to a brace by Shaun Wright-Phillips and further goals from Salomon Kalou and Didier Drogba.
Lampard was booed by the home fans throughout.
He said: "It inspires me. It doesn't bother me, I enjoy it. It was a bit of banter and there are no hard feelings."