By Alex Stevens

Kenny Miller has warned Rangers contract rebels Martyn Waghorn and James Tavernier that the grass is not always greener amid doubts about their futures at the club.

Waghorn and Tavernier, who both arrived from Wigan last summer, have rejected improved deals at Ibrox.

The Scottish Sun claim striker Waghorn and right-back Tavernier are unhappy at the terms of the offers on the table from the Scottish giants.

The key senior duo are contracted to Rangers until 2018 and are said to be convinced they deserve more lucrative new contracts based on their performances last season.

“These things happen in football when it comes to contract negotiations,” said Miller, 36, as quoted by the Scottish Sun. “Knowing the lads, how they talk about this place and how they go about their business, they fully appreciate where they are.

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“They both know the size of Rangers, and the expectation levels that are on them here week in, week out.

“Those expectations will be even more this season. The demands will rise as will the challenge. But the lads are fully aware of that.

“These things are part and parcel of football when it comes to renewing contracts or transfers. But I’d say the grass is not always greener, yes.”

Since the end of last season, Rangers have signed eight new players, including Joey Barton and Jordan Rossiter on deals that are reported to be vastly superior to Waghorn and Tavernier.

Offers made to the duo were rejected around a month ago, with apparently no current scope for renegotiation.

Both Waghorn and Tavernier were star performers as Rangers cantered to the second-tier title last season and reached the Scottish Cup final.

Waghorn, a former Sunderland and Wigan striker, scored 28 goals in all competitions despite suffering an injury in mid-February which left him out of action until May.

The 24-year-old right back Tavernier played in every league game of the previous season, scoring 15 times in all competitions.

In other Rangers news, two senior Ibrox figures have committed to new deals following a breakthrough in talks with the club.