ace couldn’t hide his delight for after he scored his first goal for the club and says the Dutchman has already earned respect from his team-mates.
The 30-year-old joined United from Burnley earlier this month after the Red Devils paid a £2.6m fee to terminate his loan deal at Besiktas.
Weghorst was signed as a replacement for , who had his own deal terminated in early December.
The Netherlands international had started twice before the 3-0 win against Nottingham Forest in the Carabao Cup semi-finals on Wednesday.
He impressed against Crystal Palace and Arsenal with his link-up play but Weghorst displayed little goal threat.
That changed against Forest, with the Dutchman pouncing on a parry from Wayne Hennessey to net his first goal for the club with a tidy finish.
And though Martinez says it’s important for strikers to score goals, he says Weghorst had already impressed his new team-mates in training with his work ethic and quality.
‘As a striker, he lives for the goals and I’m happy for him because he’s training very well as well,’ Martinez told MUTV.
‘We need that confidence and I’m happy he scored today. Now we have to work for the next game – it’s not done yet.’
With Raphael Varane rested and Harry Maguire suspended, Martinez was partnered by Victor Lindelof at the Forest Ground.
The Argentine praised his Swedish partner and says they’ve been working on their partnership.
‘I think we showed many good things, but still, we have a lot to improve. It’s a good result, I think we controlled the game today. In training, we [Lindelof] work with each other and I think we’re doing a really good job,’ said Martinez.
‘That’s the most important thing when you need a player, we have to be there, we have to be ready and Victor did very well. I think everyone is training hard, you can see now, the last two games were unlucky, we did an amazing job, but we have to keep going.’
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