Josh Cullen and Reece Burke both made their Bolton Wanderers debuts at the end of the week which saw them move on loan to the Macron Stadium.
The Trotters took on Leeds United in their Championship opener on Sunday, but were beaten 3-2 in an entertaining clash in the north west.
Hammers midfielder Cullen, who impressed in League One on loan at Bradford City last campaign, started the match for Phil Parkinson’s men, but the visitors took the lead early on when Kalvin Phillips found the back of the net after seven minutes.
The division’s 2016/17 top goalscorer Chris Wood then doubled Leeds’ lead to complete a disastrous first half an hour of the season for Bolton.
Gary Madine pulled one back with six minutes remaining in the opening period, but Phillips was on hand to double his career Championship goal-tally in less than a half of football when he tapped home before the break.
An Adam Le Fondre penalty gave the hosts hope in the second half, but Wanderers – who handed Burke a debut from the bench in the 53rd minute – could not equalise.
Parkinson’s outfit have an opportunity to bounce back immediately on Wednesday when they take on Crewe Alexandra in the Carabao Cup first round.
Meanwhile, Borussia Monchengladbach took on Leicester City in their final pre-season clash of the campaign on Friday, though Reece Oxford missed out with an ankle problem.
The Foxes ran out 2-1 winners, with Jamie Vardy bagging a brace to turn the game around after Thorgan Hazard had given the German side the lead early in the second half.