Marco Silva says Everton’s defeat by Watford on Saturday was a “big frustration”.
Everton twice hit the woodwork in the second period at Vicarage Road but were undone by Andre Gray’s goal on 65 minutes.
Gylfi Sigurdsson prodded against the top of the bar from eight yards shortly after the break, with Lucas Digne similarly clipping the frame of the goal with a free-kick as Everton pursued an equaliser.
Manager Silva’s team remain ninth in the Premier League and have a 17-day wait for their next match, against Cardiff City on February 26.
“When you do not achieve the result and do not score goals with the chances we created, it is a big frustration for us,” Silva told evertontv.
“The first-half was balanced, they created one good chance and we had a very good chance with Cenk Tosun.
“Second half was the same again. They started to create more problems with their long balls. I felt Andre Gomes and Gana were getting tired after we played on Wednesday night. Watford had one week to prepare for the game.
“I changed Andre and was preparing to put on Bernard when they scored.”
Silva introduced Brazilian attacker Bernard moments after Gray had tapped in from Will Hughes’ low right-wing cross.
Dominic Calvert-Lewin was also added to Everton’s attack – the striker replacing Sigurdsson – after Theo Walcott had taken Gomes’ place.
And Calvert-Lewin twice came close to drawing Everton level late in the game.
His header was kept out by Ben Foster in stoppage time, while a previous effort following Kurt Zouma’s lofted cross flashed past the post.
Watford goalkeeper Foster beat away a stinging drive Cenk Tosun in the opening period, while Zouma also forced the former Manchester United player into a smart stop after stooping to direct a Digne delivery on target.
Everton ‘keeper Jordan Pickford made a tremendous save of his own early on, the England number one somehow repelling Etienne Capoue’s thumping strike at point-blank range.
Silva’s team travel to face Cardiff following their extended break from action, with a Goodison Park Merseyside derby following hot on the heels of that game in South Wales.
“We reacted [to going behind],” added Silva. “We had two balls off the bar and one clear chance for Dominic.
“We created enough chances to score but were not effective [with our finishing]. Sometimes in these moments, something can happen – but it is only us who can work more to change things.
“When you play away and create the chances we did – and clear chances in some moments – we have to be more effective.
“In one moment they will start to go in and we’ll start to win matches.
“But there is just one way: work more, become more confident and look forward and try to change things.
“It is a good moment to rest the players, then bring them back to prepare for the next match against Cardiff and the derby against Liverpool.”