Ole Gunnar Solskjaer admits Dean Henderson is "not the most patient guy" as Manchester United's back-up goalkeeper continues to try and prove he is worthy of a bigger role at Old Trafford.
Having spent loans spells at Stockport, Grimsby, Shrewsbury and Sheffield United, the 23-year-old has supplanted Sergio Romero as back-up to David De Gea after impressing during two seasons with the Blades.
Henderson was rewarded with a new and improved contract upon returning to United in the summer, tying the academy graduate down until at least 2025.
The Cumbrian has since made 10 first-team appearances for United and last month admitted that "being sat on the bench is not something I want to do all the time, so that's been the hardest bit".
Henderson looks set to make another appearance in Tuesday's FA Cup fifth-round clash with West Ham, when he can stake his claim days after De Gea's disappointing display in the 3-3 Premier League draw with Everton.
"Dean has done very well when he's got the chance and he's matured," United manager Solskjaer said. "For me, he's developed his game.
"I know he's not played as many games as he would've done last season, but you see every game when he plays and in training his improvement, working hard on a couple of aspects that we've spoke about with him.
"I've been impressed with his attitude and work-rate. Of course he's, how to say... he's not the most patient guy.
"He wants to play every game because he knows that he'll perform well, so long may it continue because he's improved since he's come here."
Henderson started in the previous rounds against Watford and Liverpool, with Mason Greenwood ending a seven-week goalless streak in the latter fixture.
The 19-year-old striker has not scored in his four appearances since then but has impressed for United, looking particularly sharp in the ultimately frustrating draw with Everton.
"Mason was different class," Solskjaer said. "I thought he was the standout performer on the pitch, he just didn't get a goal that his performance deserves.
"I think the last few games if you look at him closely, I know we scored nine against Southampton but if you look at his performance I thought his performance was top and he's improved and matured immensely.
"He's working with some of the top forwards in the country, of course. He's learning off them and it's exciting to see that he's come over his blip and he's playing really, really well."
Greenwood may feature again when West Ham visit on Tuesday, but Paul Pogba will be sidelined for a few weeks.
Just days after being named the club's Player of the Month for January, Pogba was forced off towards the end of the first half of Saturday's 3-3 draw against Everton.
The French international had a scan on the thigh muscle issue and United manager Ole Gunnar Solskjaer is now expecting to be without the midfielder for much of February.
"It's an injury that will take a few weeks to heal," he told MUTV.
"He's just started his recovery, working with the medical staff and we'll get him back as soon and as safely as we can.
"Of course, Paul has been very important for us and we're not going to take any risks. (So it is) a few weeks definitely.
"You never want to be injured and, especially, now Paul was really finding his form and enjoying his football.
For us, we just have to take as many points and wins as possible, when you lose players.
"We've been very healthy and strong for a long period so we can't moan too much."
Pogba is out of Tuesday's FA Cup fifth-round clash against West Ham, as well as Sunday's trip to West Brom in the Premier League.
United kick-off their Europa League campaign against Real Sociedad this month, while league fixtures against Newcastle and Chelsea are also scheduled.
