The Gers head coach understands the need to improve his first-team options following promotion to the Scottish Premiership.
The Gers confirmed their return to the top tier of Scottish football with a 1-0 win over Dumbarton on Tuesday evening, sealing their third consecutive league title in four years.
Defender James Tavernier scored the only goal of the game in the 50th minute at Ibrox Stadium to establish an unassailable 17 point lead at the top of the Championship, as Warburton’s men returned to the Premiership following a four year absence.
Rangers still have the Petrofac Cup final to look forward to on April 17 but former Brentford head coach Warburton admits he is already looking to next season and understands strength in depth will be key if they are to return to the title-challenging force they once were.
"If we drop our standards, we get punished," he told STV. "You've seen it this season. If we're off par, below par, we get hurt and that can't happen.
"It can't happen when you've got 50,000 at Hampden [for the Petrofac Cup final] and the following week [against Celtic].
"If we can prepare well, train hard and focus we'll be okay.
"It's a good group of players, we'll add to it in the summer and the work has begun on that front.
"If we can add the right recruitment, four or five players, we'll be in a good place."