He has also urged the Reds boss to spend the money generated by Raheem Sterling's sale to Manchester City wisely.
The forward completed his big-money move to the Etihad earlier this week, bringing an end to one of the summer’s longest-running transfer sagas.
The Reds are now flush with cash courtesy of his exit, as they were after Luis Suarez’s sale last summer, and Berger has urged Rodgers to take a considered approach to recruitment, saying the need for trophies is growing at Anfield.
"Last year, they spent £100 million and were in the middle of the table," he told Sky Sports.
"In Liverpool, as a manager, you have to win trophies and he didn't win anything in three years. The beginning of the season the games they are going to play, home and away, is quite tough, so it depends how they start the season.”
If Liverpool are to win trophies next season, it is likely to be a difficult challenge, with the top teams all strengthening this summer.
Indeed, the Reds may view the last two years as a massive missed opportunity to have secured silverware under Brendan Rodgers, having come so close to landing the Premier League title in 2013/14 and disappointing at the semi-final stage of last season's FA Cup.
However, with everyone focusing on the title and Europe, there is the chance to win the likes of the FA Cup and Capital One Cup - although champions Chelsea doubled up with the latter last season. Perhaps they should take a leaf of out Jose Mourinho’s book and place greater emphasis on that competition.