Mail Sport has learned Dyche shocked his squad by aiming a jocular slap at the head of defender Nathan Patterson, 22, during a meal in the Algarve resort of Quinta do Lago.
Dyche’s intentions were harmless and it was an otherwise good-natured evening, but the 52-year-old appears to have connected with Patterson more forcefully than he intended to, leaving some of his players unimpressed.
Scotland right back Patterson was embarrassed to be the centre of attention, and tempers became sufficiently heated for captain James Tarkowski to step in. He took Dyche to one side to allow any lingering ill-feeling to subside.
The pair left the table for a while before returning to finish their meals with the rest of the squad. Dyche is understood to have apologised to Patterson.
Everton sources insist there was no major bust-up, claiming the incident on Wednesday was a clumsy joke that backfired, but it caused a stir among fellow restaurant diners.
There was no obvious bad blood between Dyche and his players for the rest of the trip, with Everton training well on Thursday and Friday before flying home.
Everton spent the week in southern Portugal because they do not play again until visiting Bournemouth on March 30. Dyche had hoped the change of scene would lift the spirits of his squad, who are on a run of 11 league games without a win.
One more would equal their longest winless run in the Premier League era — under Mike Walker at the start of the 1994-95 season.
Everton’s poor form has seen them slump to 16th in the table, four points above the relegation zone.
The club are in the thick of the relegation battle as a result of being deducted six points — reduced from 10 after a successful appeal last month — for breaching Premier League profit and sustainability rules.
