"I was very happy because it was the goal which gave us the peace to relax and make the game more comfortable".
He told Standard Sport: "Diego has been massive for Chelsea this season".
Costa's goalless run in the premier league has stretched to four games, but Antonio Conte insists the striker still remains a key part of the squad.
'But it's not just about that, with the way we play, he is very important.
"Then we conceded and lost a bit of confidence but then we managed the game and scored another with Marcos Alonso".
"Diego is very good for the group. The club do a lot for me, the fans, my teammates and this is a winning team, which motivates you to be there a long time more".
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Clad in a white shirt and grey suit, Lee, himself the vice-chairman of Samsung Electronics, was mostly expressionless. In recent weeks, the Korean tech giant unveiled its new flagship smartphone: the Samsung Galaxy S8.
Chelsea have Everton striker Romelu Lukaku and unsettled Arsenal forward Alexis Sanchez on their hit list, if as expected Tianjin Quanjian return for Costa in the summer.
It was not the best performance the Chelsea striker has produced this season, but his side maintained their seven-point lead at the top of the Premier League table despite an off-day from the Spain global.
Five wins from their last seven games will now be enough for Conte to claim a title in his first season of English football, and Alonso claims he and his team-mates will treat every remaining game like a cup final.
The 28-year-old was heavily linked with a switch to the Chinese Super League in the January transfer window but ended up staying at Chelsea and certainly looks to have made the right choice.
The Spain worldwide has two years remaining on his Chelsea deal and has recently been quoted as saying that despite not being entirely happy with London life, he will see them out.