Slaven Bilic has been impressed by Diafra Sakho's attitude since his transfer deadline day move away from West Ham collapsed.
Sakho flew to Rennes for a medical only to discover that the Hammers had not agreed to sell him to the French club, forcing him to stay at London Stadium despite his desire to leave.
Bilic insists he has put the saga behind him, however, after watching the Senegal striker score the second goal in Tuesday's 3-0 Carabao Cup victory over Bolton.
"Sakho's attitude and mood are spot on. Really spot on," Bilic said.
"He's very motivated in training and looks really good. That's why he's playing for us, whether it's starting or coming on.
"I don't have any complaints whatsoever. I've said before when his attitude has not been good, so I'm not lying or trying to hide things. His determination is really good and he looks really good.
"He's injury free and is willing to train and play well for West Ham United."
Marko Arnautovic insists West Ham are putting their dismal start to the season behind them after easing into the fourth round.
Arnautovic toyed with Bolton on his London Stadium debut, providing two assists in a victory that has propelled the Hammers to two wins and a draw since losing the opening three matches of the Premier League campaign.
A month earlier the club's record Â£25million signing was sent off for use of the elbow against Southampton, delaying his first home outing and incurring the wrath of Bilic, but he has already begun justifying his transfer fee ahead of Saturday's visit of Tottenham.
"I'm really pleased with how we played, how we acted. Of course we can always improve. We had many chances to score more goals, but we played very solidly and we can progress like that," Arnautovic said.
"The first three games of the season was not West Ham, but now we're progressing and getting better.
"Bolton had nothing to lose. They came here and wanted to impress, but I think we handled this perfectly.
"We didn't let them have any chances, we played solidly and we showed good personality and this is the most important thing.
"We have done our job and played well, but the game is gone and we have to focus on Saturday.
"This is a London derby and we are playing at home, so of course we want to win, but it's going to be a tough challenge. Tottenham are a very good team."
Bolton are rooted to the foot of the Sky Bet Championship and are searching for their first win of the season when they host Brentford on Saturday.
"We're in a difficult position. We have to rest the players and then pick a team which is fresh enough to play well this weekend to get our season up and running," boss Phil Parkinson said.