Former Real Madrid man Morata missed a trio of gilt-edged chances as the Blues finished with just a point from their trip to the Emirates Stadium last night.
Speaking to talkSPORT’s Sport Breakfast earlier today, the iconic Blues striker said: “It’s very difficult to be too hard on him because his work rate is really good.
“Even yesterday, he really is a player who works for the team.
“But, to be honest, yesterday I was a little bit disappointed.
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“Morata, in my opinion, has the quality to be a really top, top player, but when you see him miss those goals, especially the one in the first half, you expect him to be a little bit cooler in front of the goalkeeper.
“He needs to be a bit more ruthless.
“He’s a player of amazing qualities, but one of the things I had some doubts about when he came to Chelsea was whether he was tough and ruthless enough.”
The 25-year-old arrived at Stamford Bridge in a whopping £60m deal from Madrid in the summer and started brightly, scoring 10 goals in 19 Premier League games.
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But fans too have been disappointed by his lack of cutting edge in front of goal recently.
“His stats are padded by his hat-trick [against Stoke] and he hasn't been incredible for us so far,” wrote one fan.
“That being said, he clearly has a lot of potential because he manages to get into all of these positions so regularly and that's what we've been missing since Drogba left.”
Another wrote: “His shocking miss vs Atletico cost us the match when we should have won and topped the group that day. Missed a few chances vs West Ham as well.
“This isn't the first time.”