Modric was speaking to the press ahead of Tuesday night’s Champions League quarter-final clash at Juventus.
The Croatian made a case for Bale, his close friend, to be included in the team to face the Serie A champions.
Bale scored twice in Saturday’s 3-0 win over Las Palmas, but could lose his place in the starting line-up against Juventus.
“Gareth is happy at the moment. It’s been a difficult season for him with injuries but he is training well, playing back to back games and scoring goals.
“We all know what he brings to the team. When he is physically right he shows his quality. He is very important for us. He pace and direct running helps us and that is why it is so important that he is fit for us,” he said.
When asked about Bale’s biggest rival for a starting place, Isco, Modric added: “If we play with one or the other the important thing is that we are together on the pitch. If Gareth plays or if Isco plays it’s the same. Isco is a fantastic player. Both give a lot of quality to the team.