Silva's first visit to Vicarage Road since being sacked last January ended with home fans singing he would suffer a similar fate at Everton with the Merseyside club collecting only 11 points from their last 14 league matches.
"It's not good for us as a club, and for me as a manager it's not good," Silva told reporters.
"I'm concerned but we have to work more and more to achieve the results that can grow our confidence."
Everton's majority shareholder Farhad Moshiri said last month Silva was the right person to guide them in the long run as they move ahead with plans for a new stadium.
However, the British-Iranian businessman, who increased his ownership stake in the club to 68.6 percent last September, has not hesitated to sack managers in the past having dismissed Ronald Koeman and Sam Allardyce before bringing in Silva.
Everton return to league action with a trip to Cardiff City on Feb. 26.
(Reporting by Shrivathsa Sridhar in Bengaluru; Editing by Christian Radnedge)
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