Locke has been appointed boss on a permanent basis after he took over in the interim following Allan Johnston’s departure in February.
He said his side will do everything they can to secure a top-six finish in the Scottish Premiership in the next three games but acknowledged that Motherwell would provide a stern test for his players.
“It will still be difficult,” Locke said. “We’ve got three games left and we need to win every game I would think if we’ve got any chance of the top six and we need other results to go our way but while it’s mathematically possible we’ve got to try.
“We’ve been on a decent run lately, disappointed last time out against Ross County and we’ve got a really tough fixture here tomorrow against Motherwell and if we want to get in the top six we need to try and win that one.
“I wouldn’t say it is vital, the club can get on with things if we do finish in the bottom six but financially it would certainly be a little bit better – you get another game against Celtic obviously which helps the club financially.
“We know it is going to be difficult, we will try our best to get there, but if we don’t it’s not the end of the world. We’ve got to try and finish the season really strongly and build towards next season.”
Defender Manuel Pascali and midfielder Craig Slater are suspended for the visit of the Steelmen in the Scottish Premiership.
Midfielder David Syme is in contention as Locke looks to start his tenure as permanent Killie boss with a victory.
Motherwell defender Simon Ramsden will return from suspension for the clash at Rugby Park on Saturday.
Steven Hammell has recovered from his groin injury and midfielder Paul Lawson is back from a calf complaint but the game comes too soon for both.
Midfielder Iain Vigurs (sciatic nerve) remains on the sidelines.