Manor's Will Stevens says he expects new team-mate Alexander Rossi to be quick and is convinced the American will do a "good job".

Rossi will make his race debut in Formula 1 this weekend in Singapore after the announcement on Thursday he will replace Roberto Merhi for five of the seven remaining events.

Talking about the late change at Manor, Stevens said: "I know him [Alexander] well. We were both reserves here last year. He is quick and has been here before. He needs to find his feet again with the car this weekend, but I am sure he will do a good job and I am looking forward to working with him in the five races he is going to do for the rest of the year.

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"He is a good guy. He is doing well in GP2 at the moment. He is going to be quick in the car. Obviously it is not the easiest place in the world to start in your first grand prix, but at same token he has been here before in GP2 and he likes street circuits, so [as I said] I am sure he will do a good job."

Meanwhile, Stevens also added that he is glad Merhi will still be around as a reserve - when he is not racing in Russia and Abu Dhabi that is - and believes the Spaniard can still play a key role: "Roberto has done a good job for the team so far and he has still actually got quite a big part to play for the team for the rest of the year," Stevens continued.

"He has still got two more races to go. He has had the same experiences I have had this year and it is good that he is still going to be around to help from the engineering point of view - it always helps the more people you have around to voice their opinion.

"He has done a really good job so far and it is good that he has still got a few more races to go [when Alex is back racing in GP2] and the opportunity he got with Manor has been really good for his career.

"Obviously for him he would love to be in the car [here], but at the same token, he has also had a great opportunity."

Asked if he expected the change, Stevens replied: "No. There has been in the press all year about Roberto only being in for the first few races. But if I am honest, I never knew what his arrangement was.

"There was obviously always going to be the possibility that was going to happen. This time of year everyone is trying to sort out things for next year and if there was the potential for someone to come in, who is looking at things for next year then we knew that was going to be a possibility. I found out yesterday and obviously Alex has been on the fringe of F1 for a while. And if you were going to select a handful of guys, who were going to look at doing it, I am sure he would be one of them."