NEIL Harris is pleased with the progress made by Millwall's U21 players this season.
Harris, the Lions' all-time leading goalscorer, is in charge of the club's development squad.
And he says Millwall's young players have taken big strides forward in recent months.
Fred Onyedinma, Jack Powell and Aiden O'Brien have already featured for the first team this term but Harris believes they will continue to improve by playing reserve football.
Powell was named on the the Lions' bench at Bournemouth on Saturday, while Onyedinma made his debut for Wycombe after moving there on loan.
"Individually they've all got great ability but there's a lot they can learn as well," Harris said.
"Fred is a good example. He's very exciting with the ball – he loses it but then gets it back and he'll go on another run.
"The end product isn't always there but that's a 17-year-old winger for you. Powell was the best passer of the ball at the club last year but wasn't ready physically for the first team.
"He worked hard over the summer at getting stronger and since then he's had his chance.
"Aiden also has great ability, touch and awareness but he needs to know where to run and he's doing it."
Wycombe moved for Onyedinma after his impressive performance in a behind-closed-doors cup tie with West Ham.
"It was really pleasing to see how good he was off the ball," added Harris.
"His movement and runs were terrific – he knew when to run in behind and come short, and that's what Ian Holloway is always talking to him about."
Harris has been running the rule over trialist Anthony Jeffrey, a former Arsenal trainee who had a brief spell with Wycombe last season.
"He was recommended to us by a reliable source who we know and trust," Harris said.
"It makes sense to bring him in and have a look. He has played a bit of league football, he's only 20 and he had a good grounding at a Premier League club.
"He's got pace and power and he's direct, which are good attributes."