Cape Town - Following his storming drive to sixth place in Germany, Guenther Steiner says "consistency is the magic word" for Romain Grosjean to secure his Haas future.
Grosjean has had a mixed campaign this season as while he has put in drives such as his German efforts, he has also had too many crashes.
The last was in Britain where he first collided with his team-mate at the start and then crashed out of the grand prix altogether in contact with Carlos Sainz.
Added to that he also crashed behind the Safety Car in Baku and caused carnage at the start of the French GP.
There was, however, some redemption last Sunday when he stormed from 10th to sixth in just ten laps.
When asked about Frenchman's future, team boss Steiner told Motorsport.com: "Consistency is the magic word and he knows that, it's nothing new to him.
"We know what he can do, he knows what he can do and you guys know what he can do on a good day - he's pretty outstanding on a good day, we just need to get him a bit more consistency.
"He drove a fantastic race in Austria and a very good race last weekend [in Germany], we just need the consistency out of him.
"If he starts the weekend good, it normally goes good. For me now, the biggest thing is to keep him good on Friday - then normally that takes him into Saturday and Sunday in a good place.
"But again, it's difficult to manage, because we just can give him what he wants on the car and the rest he has to do."
The boss added that Haas' performances this season had caught the attention of other drivers with the team set to look at their 2019 line up following the August break.
"I wouldn't say we are shopping around - a lot of people are shopping with us, I would put it this way. There's people asking, and for obvious reasons.
"Everybody's looking everywhere but nobody's deciding what to do, so somebody will make the first move.
"One of the first moves will be what is Ferrari going to do, for the future, what is Renault going to do for the future, and then we small guys come in.
"We can decide before - we don't have to wait for their decisions - but that will trigger the market.
"We will decide after the holiday what we want to do."